I switched to a mac trackpad years ago due to hand pain that comes whenever I grip/use a mouse. Something about that half-closed-hand light grip has become just super painful. Unfortunately I still need to use one for FPS gaming, just haven't found a controller to match the speed and precision needed to aim and fire at a game opponent.
>haven't found a controller to match the speed and precision needed to aim and fire at a game opponent.
Gyro aim is a must, and if you wanna be the best you can be, I would also suggest learning Flick Stick, which in addition to using gyro, remaps the right stick to immediately turn to the direction you tilt it in, allowing instant 180s (at the cost of no longer aiming vertically at all). Steam Input allows you to set this up for any game. You need to initially dial it in by adjusting how many pixels a 360 degree turn moves until you can do two 360s and be aiming in the same spot. You can do this by temporarily binding a button to do a 360 degree rotation and then finding something in the game to stare at. You can find videos of people doing this on Steam Deck.
As for the controller, I'd currently recommend the 8BitDo Pro 2 or Pro 3, but if you can wait, the new Steam Controller should be even better.
I'm in the same boat when it comes to gaming. Primarily use a trackball mouse and have used it for some games like World of Warcraft or Path of Exile but a traditional mouse is still king for any FPS game.
I did learn recently that Zowie released an ergonomic version of their mouse that I plan on checking out though. Unfortunately there's just not a ton of options out there for ergonomic gaming mice.
Consider trying a vertical mouse. They look odd and the first day or two it is strange but after a while it becomes second nature. It was only after using one for a few mo ths that I realised most of my issues with typical mouses.
Also it is funny going back to a standard mice, it feels like you are awkwardly using a tiktak for input.
Yep that's what I currently use--it's the only way I can even bear holding one.
Some people use console controllers on pc playing competitive FPS games (see for example TheBrokenMachine), maybe thats an alternative for you? Personally I think it would take me 5+ years to get used to tho…