I believe this is because if the devs don't have set categories, the steam workshop allows anyone to use any tag they want and just creates a new tag filter for literally any tag that gets used, and the filter doesn't get deleted even if the mod that used it does. So either the devs choose the only tags available, or anybody can use any tag that they want and the workshop will make a filter for it, there's no in between.

Kinda sucks, but it is what it is. Wouldn't mind switching over to some set in stone tag categories myself though.

Sure they'd hop to it pretty quickly if the community itself muddled out what tags they want/need and submitted 'em on the bitbucket issue tracker.

I'll start compiling a list with some folks in the #modding discord and submit it sometime this week, but here's some I shot off my lobe real quick if ya got any suggestions.

meta:

• Stable (mod aims for compatibility with the stable branch of the game)
  
• Beta (mod aims for compatibility with the latest beta branch of the game)

standard:

• Armor
  
• Artifact
  
• Book
  
• Cheat
  
• Creature
  
• Gender
  
• Genotype
  
• House
  
• Item
  
• Item Mod
  
• Library
  
• Lore
  
• Map
  
• Music
  
• Mutation
  
• Pronoun Set
  
• Quest
  
• Resource
  
• Skill
  
• Subtype
  
• Tileset
  
• Tool
  
• UX
  
• Weapon
  
• World

Edit 1: Added UX and a few others

I would want one for UX - I like the mods that improve the UX.

Created a page on the wiki to edit with suggestions here
https://cavesofqud.gamepedia.com/User:Armithaig/Workshop_Tags

OK, tags've been shot off to unormal/alphabeard. Check the wiki for final tags.
Here's a preview'd html-bashed until I got bored halfway through.[i.imgur.com]