Music theory is so crucial to optimizing communication, understanding, and speeding up progress that I fundamentally disagree with what you're saying. Music theory provides the tools to build, where otherwise you have to buy your parts. You have to find a chord online, read a tab, put in effort where music theory could just give you the answer in an instant. My rebuttals in line...

I think modes are mostly unnecessary to the majority of musicians (and especially the musicians on this sub).

This is an unfair assumption and generalization. If I put my two cents in, I don't think you're really a musician unless you have a musical sensibility. Anyone who properly knows music theory in and out will have a musical sensibility. This doesn't say that you can't get by without it, but it's a surefire way to become a better writer, performer, listener, etc. The problem is that the barrier to entry on music theory is higher than you think it is.

Talking about modes is going to be an impediment to effective communication with most musicians rather than a facilitator.

This is not a result of modal theory being "too technical to emote effectively", it's a result of people not grasping what modal theory actually is. If you think knowing that "Mixolydian is an Ionian scale's intervals with a flat 7th", you're doing the same as saying a "car is hunk of metal, with an engine that makes its wheels turn". It's a huge generalization and "big picture" mentality that overlooks the details of each nuance that makes you musically adept. A mechanic can take build a car engine from its parts, but an engineer can build an engine from scratch, and this is the difference between the types of people that "know theory" and "understand theory".

WHO CARES? What sounds good? Play that, for heaven's sake.

I agree, if it sounds good, fuck yeah. "Breaking" common music theory principles is just as fun as following it to the letter. I just don't think it's black and white, where "most people can't use theory to help, it's an impediment". That's just not true, it's moreso that "most people will have trouble truly grasping it", but that's the case with all higher-level methodologies, and it's no reason to discourage trying to learn it.

All-in-all, if you make something that sounds good to you, or to your listener, that's all that matters, so we agree on the end game. I just think you're massively disregarding the cost:benefit of learning music theory.