Look at the replicate magic item lists. The 2nd & 6th level ones are relatively appropriate and the value of the +1 on a nonmagical weapon is still good because it's not until 5ish that the party is likely to have them. After that however that +1 weapon/armor doesn't improve till 11th & never gets better again wile the +1 and some minor stuff like radiant weapon just never improve to begin with.
So at 6th level they can swap out their enhanced weapon infusion for the radiant option. The power of blinding your opponent generally improves with the power of the opponents you face, so they may or may not want to swap back to enhanced weapon at level 10 for the +2 bonus.
Note also that there are quite a few weapon and armour infusions that offer benefits useful at all levels.
The higher an artificer goes the more hat replicate magic item needs to pickup the slack for those infusions but instead of doing that it fails at doing so. Look at the level 10 & level 14 replicate magic item lists, yea there are a couple good items but even those wouldn't be out of place if obtained earlier & even some of those are made not useful due to obtaining them too late(ie gauntlets of ogre power). do you really think that a 10th+ level character is needed to keep a quiver of ehlona, uncommon boots of the winterlands, wonderous item brooch of shielding, wonderous cloak of the bat(oops that's actually on the 14 list not 10), wonderous hat of disguise, uncommon helm of telepathy, uncommon medallion of thoughts, uncommon gloves of swiming & climbing, wonderous necklace of adaptation, uncommon periapt of wound closure, uncommon ring of jumping, uncommon ring of mind shielding, or uncommon slippers of spider climbing from being unbalancing to the 2nd or 5th level list of replicate options?
I think that all of those items are going to be useful, particularly on a situational basis when you get a pool of potential ones available for the next day, and get to swap one every level.
These are not like finding the item as treasure, whereupon you have that item all the time and get to use it when the right situation comes up.
An infusion replicating a Hat of Disguise is not just like having a Hat of Disguise for example. Its like having a Hat of Disguise that you can swap for Winged Boots or a Necklace of Adaptation overnight to fit with whatever your plans are for that day, and swap for anything else on that list when you level. The more situational the item, the more powerful the ability to produce it when required is compared to simply having the item.
These are class abilities. They are in addition, not instead of, whatever the party actually finds on adventures.
do you think there are many strength or int based characters needing or even benefitting from gauntlets of ogre power or headbands of intellect still by level 10 when they become replicatable? It's just a recycled grab bag of a few good items a tier or two too late to stil be meaningful in most cases that is padded out with stocking stuffer neat but not very likely to change much at any level a gm awards them to players
I think that being able to set their Int or Str to 19 is probably going to be useful to several members of most parties. I do not believe those items were never intended to be for characters that are based around those abilities.
If you're expecting that an artificer should be able to provide an item that removes the need for a character to invest in their primary ability score at low levels, then that strikes me as quite frankly, unrealistic.
People keep saying that, but the mechanics of artificer don't really support doing that & more importantly it's probably not really needed after level 5 or so in most of wotc's HC adventures.
Just to be clear, are you claiming that wotc's HC adventures have enough magic weapons that any character will have a magical version of their preferred weapon fairly soon after 5th level? Is this because they have so many that the characters can pick and choose, or because the DM is instructed to match a found weapon to the optimal chaoice for the characters?
It strikes me that even if, as you say, any wotc adventure is going to provide an enchanted hand crossbow for the fighter, they might still prefer to use one with the repeating shot infusion on it until the adventure provides the +2 hand crossbow.
No at level up he can do that swap, that's hardly accomplishing
It is exactly accomplishing that, unless every single weapon-using member of the party gets a magical version of their build's optimal weapon between one level and the next, and the party already have more than they can use of every other infusion that the artificer knows.
Remember that the artificer knows twice as many infusions as they actually have active, nd they can swap those around on a long rest.
This whole line is like saying that warlock imited spell slots make sense because they can change spells at level up to cast whatever spells the party needs. The difference is that those warlock spell slots come with a powerful feature in the form of getting the back on a short rest while the powerful feature for the infusions never made it to print.
Its more like wizard spells: They can daily change them in and out between a limited pool, and they can adjust that pool every level.
More importantly the artificer specific infusion items and replicate magic item lists don't fill the slack once +1 is met.
Really? You think that blinding an opponent or blasting them back, a thrown weapon returning to your hand, or ignoring half cover with your spell attacks as well as a +1 bonus is only as good as a +1 bonus?
You think that automatically passing a concentration check 4 times a day, or having an extra 3rd level spell slot, or being resistant to an element is of no use to a character once some members of their party have obtained +1 items?
I think you might be pretty far off base by suggesting that +1 stuff is what is needed to qualify as "monty haul" +1 weapon & +1 shields are only uncommon. +1 armor is rare sure, but you can't make more than one so it's still absurd to say it's monty haul.
edit
And I think that you're pretty out of order to attempt to claim that I have ever said +1 stuff qualified as monty haul. I would suggest you read the post that was a reply to and then decide whether to try to justify your claim, or simply apologise.