Those help but they are definitely not required. CS is fundamentally a game about first aiming skill (which you have to train) and reflexes, and then with skill becomes a game about strategy and map knowledge. Obviously at the highest levels you're not getting very far on a $5 mouse and a 60FPS monitor but you can get about halfway up up the ranks before it starts being a problem.
Just mouse should be sufficient. Back in 2015 I managed to get up to DMG rank on Macbook with a decent Razer mouse.
Now you can get gaming mouse with a good sensor for ~20 eur.