i play quake / other twitch shooters and i have used a membrane keyboard, cherry mx mechanical keyboards, and low profile switch keyboards and they are identical. you just need a few days to get used to the new keyboard, after which there is basically no difference. (rubber dome keyboard do get old and when they do you need to replace them, but they are cheap, like 5~10euro)
if anything, i recommend tenkeyless keyboards because it leaves more space for the mouse to move, and nobody actually needs the numbpad.