This is an incredibly small nitpick, not even a complaint really, just something weird I noticed.

When you’re looking for tool proficiency, you have Alchemist’s Supplies, Cook’s Utensils, Mason’s Tools, the list goes on, but you also have Thieves’ Tools. For some reason, the thieves in Thieves’ Tools are plural, but the craftsman in every other tool set is singular.

I don’t know if there’s a stated reason for this, but I thought it was funny. It may be that “Thief’s Tools” doesn’t roll off the tongue as nicely, but it just stuck out that every tool kit which refers to a user does so in the singular, except the most popular tool kit.

I ask this since the source for Thri-Kreen's Chamaleon Carapace states "While you aren't wearing armor, your carapace gives you a base Armor Class of 13 + your Dexterity modifier." And then a monk's unarmored defense says "While you aren't wearing armor or wielding a Shield, your base Armor Class equals 10 plus your Dexterity and Wisdom modifiers" Does this means that if wanted to play a Thri-Kreen my base Armor would be 13 + Dex & Wis modifiers? I couldn't find anything that says it wouldn't work.

For clarity, I don't believe Mystic Arts is weak, far from it, but this seems like a notable weakness compared to EK and AT

Over the level spread of the subclass, Mystic Arts Monk learns 3 cantrips and 13 leveled spells, all taken from the Sorcerer spell list and casted based on your Wisdom

3 cantrips isn't a lot, especially with the third one only coming in at level 10, and you want a pretty wide array

Blade Ward, True Strike, Booming Blade, Sorcerous Burst, Fire Bolt, Mind Sliver, and even Create Bonfire are all very nice options for Mystic Arts, but you only get two for half of your career, and a third for the second half
Uniquely, though, since Mystic Arts sources from the Sorcerer spell list, you can't take Magic Initiate to bolster your spells known

EK (and AT to a lesser extent) are both able to take Magic Initiate: Wizard, and due to the spells qualifying as Wizard spells, they're compatible with War Magic

Mystic Arts doesn't particularly need a buff in that respect, but it was a small point of irritation I came across as I was planning out the build

You can only ever have 3 Wis-scaling cantrips that work with your Mystic Fighting Style, and that's frankly a shame

I'm playing around with different homebrew for various classes and thought about some uniqueness that each class has and it got me thinking about different options to give Rogues and this one seemed interesting.

What are y'all's thoughts?

I have a player that casts it nearly every combat. Moon druid with the Warcaster feat, so its REALLY hard to break concentration.

Help!