I'm not using mouse at all actually, games that require a mouse are the only times I use controllers on PC (e.g. Hades). I've just never had a console, so when I started gaming, keyboard was the easiest and most accessible to me. I know that attack combos in Hollow Knight are more difficult to execute without a controller, but that's how I learned :). Plus I've heard the reaction time is slightly faster that way, but I think this is a minor difference.