"wrong" is kind of hard to explain for 99% of people tbf. I've kept developing tendinitis because of a muscle imbalance in my forearms. My form and flexibility are better than most gym goers and I still had a recurrent injury that took nearly a year to solve. Most people aren't doctors or kinesiologists or the esports equivalent of kinesiologists, so its kind of dumb to say "just use better form and u wont get hurt lol" and then claim exercise doesn't cause injuries. The asterisk ends up applying to most of the population.

Proper exercise can be beneficial for wrist/elbow pain though. Building up my wrists flexors has made my tennis elbow much less severe. Second biggest help was the minute I felt something bad building up I took a week off. If you have any wrist/elbow pain for more than a day in a row, its time to take at least a week off the computer, or you could be looking at 6 months

also stringcheese got downvoted for posting easily the best post in this thread. Maintaining as neutral a wrist position as possible is the best way to prolong your esports career. If you can't use a different mouse, make sure there's no flexion/extension on your wrist if nothing else. Keeping my armrests on the same plane as my mouse fixed this for me and makes the computer a lot more comfortable. Keyboard pads are great for typing too.

Is it really? Do you have links? I'm interested in sources.

Haven't had really bad wrist issues but when I was actually playing tf2 last month I've had an issue which is now persistent where my right index finger trembles if I tense my hand much. Probs going to go to a physiotherapist when I finish my exams.
Don't think its a sens issue though, more of a mouse grip issue.

no pain no gain

I used to get pains but since I started doing exercises for piano the pains have gone.

the way carpal tunnel works means that if you literally never moved your wrist you'd be hard pressed to get it. The TF2 community assumes that people who use lower sens move their wrists less even tho that makes no sense if you think about it for more than 20 seconds. Unless you're using a Cloridium style sensitivity >4 ft/360 you'd still need to move your wrist to actually hit any fine detail. if a player is 8 degrees of the view field, a 10 in/360 player will need .2 inches of movement to completely cross them with the mouse, while a .5 in/360 player only has .008 inches of player. The difference is p big, but both are far too small to ever be something you're going to hit without wrist movement.

your pains have nothing to do with your sensitivity. It's most likely due to an existing condition or the way you play and position your arm/wrist/fingers. you may be putting too much pressure on certain parts of your wrist or holding your mouse in a strange way.

ive never had even a touch of uncomfortability let alone pain playing thousands of hours of this game with high and low sensitivities. I palm grip my mouse.

use a mouse that's relative to the size of hand you have. sit in a position that seems natural for your body and limbs. sit at a height that allows you to have comfortable control of your mouse with arm movements while minimizing wrist and finger movements. make sure no parts of your arm or wrist are under any pressure, edges of desks and thick mousepads are common pressure points that may lead to carpal tunnel.

fingertip and claw grips are notorious for causing wrist and finger pain. there's a bunch of csgo players whose careers might be about to go up in smoke because of pain and inflammation. most csgo players use a fingertip hybrid grip.

this strawpoll is really shocking to me. never would have guessed so many people have pain when they play this game. follow my advice above and maybe it will help you. personally if I had pain while playing and didn't know what was causing it I wouldn't continue playing. this game isn't really worth potentially damaging one of your most important body parts permanently.