I hate to say it, but it's not an option to leave out strength based ranged weapons, i.e. thrown weapons. Strength-based warriors need javelins, ideally hand-axes and slings as well due to physical resistances that might pop up.
Javelins are technically in the game with ogres throwing them, though they do it via a separately-implemented action. Slings not being in the game would mean that most weapon-based ranged attacks against enemies like skeletons and golems would either be half as effective or absolutely useless.
You'd also eventually have to come up with unique weapons of those types
I mean, a +1/+2/+x version of a weapon is already something. We have every kind of martial melee weapon available but only a few types have unique magic versions at this point (there isn't a single unique scimitar, for example, despite it being a staple for a dual-wielding martial class). It's certainly already better than Solasta in this regard, where certain weapon types are either obsolete (handaxes, clubs, spears) or non-existent (most of the martial melee list, slings as well).
I don't know how the pipeline for adding new items looks on Larian's end (my personal gold standard for this kind of thing is how NWN did it, where you just open the editor and use wizards to create child versions of base items, like a unique halberd, or a new type of ammunition), but considering how many mods have already appeared that add new gear, it shouldn't be that big of a deal.
I dont think there needs to be some huge mechanic rewamp, or special amunition type for every single weapon
I suppose a simpler (if corner-cutting) solution would be to rename all the arrows as "missile". Making them a "missile of fire", a "missile of darkness", and so on, with a vague icon. It magically becomes an arrow when shot from a bow, a bolt if shot from a crossbow, or a bullet if shot from a sling. Problem (kinda) solved, but it's still underwhelming in a way. Ranged weapons do have the ammunition property on them, but right now it's just a meaningless tag, since we have no quivers, and managing ammo outside of special arrows is definitely a mechanic that's noticeably absent. I don't really want to see it go in the name of the casual player's convenience.
