Well, they make sense when they enhance specific class features, like letting you regain sorcery points when you deal fire damage or something like that. Even the wizard locked spellbooks kinda make sense, even though they could have just require that you have the avility to add spells to a spellbook (which a tome lock or someone with ritual caster feat could do before 2024), but my wife's Artificer has one of the spellbooks from Tasha's, and I am having to houserule that feature back in so she doesnt lose it by updating.
The problem I have is that, overwhelmingly, the class locks are entirely for things like gatekeeping spells to casters. However, the reverse isn't true - the only weapon that I can think of with a class lock is the Holy Avenger. I've never seen anything that is restricted to Fighter, Barbarian, Rogue, Monk, or Ranger.
It also has the negative side effect of being unfriendly towards any potential future classes.
But in the case of Artificers? There seems to be an odd restriction on giving them access to rods and staves in the first place. I can kind of see rods somewhat, since half of them are functionally magical maces, but why is the Artillerist not making staffs? I'm not sure how it could be used and abused. Its not a problem when a Druid gets a staff with some of the most powerful T2 damage spells in the game, but it is when the Artificer does?
Yep. I can buy rope and just...be pepared. I cannot duplicate the 2014 tinker items. Not even with the cantrips they are based on.
Going back, lets see... you have a tiny light source, prerecorded message, odd smell / sound, and the pictures. The odd smell/sound IS presigitation. I suppose that the light can be replicated with the Prestigitation tiny flame, but that requires a candle - the artificer power is honestly closer to a small Light cantrip than it is to Prestigitation. The pre-recorded messages and pictures, however, are unique to the old Artificer; at best, we're talking Minor Illusion?
Honestly, the easiest solution (and one I'm shocked they didn't take) was to make the above into just... another cantrip. Its not going to hurt anyone's feelings if you make another cantrip in the style of Thaumaturgy, Druidcraft, Prestigitation and give it to the Artificer. I don't think anyone would be upset if it made its way onto other spell lists either (though I'd probably only do Artificer and Bard). They could have also made it into a common magic item, I suppose, though that's less interesting imho.
Free Mending cantrip is the only real winner here. Free healing on your construct-pets / cannon, and not uncommon to be used in exploration stuff.