Here is my three wishes for Next weapons, armor, and other gear.
1.) It should reflect real world arms and armor, but not be strictly limited to any particular time or place. I have no problems with lamellar armor, scimitars, nunchucks, greatswords, rapiers, and hide armor all being for sale in the same town. D&D is a anachronism of fantasy, it doesn't need to be accurate. I'm less forgiving on things that didn't exist, either due to historical fallacy (splint) or being utterly fantastical (mecurial greatswords).
2.) Its stats should be derived for balance. I really don't care if you could do cartwheels in plate or cut a tank in half with a katana, I want armor to have some trade off for better protection and no weapon being utterly superior to all others. In other words, I don't mind it LOOKING real world, I want the stats crafted to keep balance.
3.) I never want to see a "fill in the numbers" item. There were lots of items in 3e which were developed to fit a certain damage die/crit mod/damage type paradigm. Don't do this. I don't want to see super-spears, stab-axes, or other nonsense.
Other than that, I'm fair. I just don't want to return to an era of clearly superior weapons/armor and everything else is junk.