Let me see if I can't produce a more jovial reply, now that I've gotten a good night's sleep, [MENTION=6802951]Cap'n Kobold[/MENTION]
True utility requires you not to have a single price for a generic weapon. Suboptimal weapons that even with a bonus to hit and damage won't be used as a primary weapon have less power and utility than a weapon like a longsword that will be used for the majority of attacks that the character makes. Furthermore, since we are assuming most optimal usage of items, weapons that can be optimised more than the standard longsword are required to be more expensive/less available.
Oh, I agree. I just think there's no good reason to make
the longsword the average. In general D&D-iana, it might be considered the "standard" weapon. But we've seen enough "nobody's using longswords" threads to know that is not reflective of the truth in this edition. And this thread is meant to be reflective of 5th edition specifically.
When I speak of the generic +1 weapon, I mean the best-in-class +1 weapon.
In some sense, I could agree to make the rapier that weapon. But at least in game with feats, all my players that has created martial characters has opted for the "big guns", and so two-handed weapons see much more use, relegating one-handed weapons to specialist usage (such as Rogues and Monks).
So in my view, the +1 weapon we need to price first is the two-handed weapon. Whether we end up selecting the glaive, the greatsword or the hand crossbow is, in my opinion, not a primary issue, and I'm happy to leave that for later. After all we're in agreement it ain't the longsword or the sickle and that's good enough for now!
Under the assumptions of a true utility system that you have initially set out, it would be hard to justify not taking the base properties into account, just like you do with armour.
We agree the d20 approach where every weapon are priced much like every other weapon, and where every armor is priced much like every other armor, is not good enough.
But you might have missed this up-thread: I have argued this is not as large a problem as it may appear.
Why? Since overpriced items is much less of a balance issue than underpriced items.
Meaning that for our first pass, if we stick to the best-in-class items, we get a "good enough" structure imo, even if it means nobody will ever buy a +1 sickle as long as there's also a +1 glaive available.
Then, when we have an actual price structure, let's go back and discuss how much less that +1 dagger could cost, to make the choice between the two interesting (which I think we agree is the ultimate goal here).
Regards