The advantage of the PC platform is the ability to choose the input method. KB+M is superior for RPGs, strategy games and shooters, but the controller is better for action and racing games, and when you just want to sit back and relax. I personally almost never use KB+M since I barely play the aforementioned three genres.
Precisely this, for me. 90% of my time is spent with a mouse and keyboard, but for some games, a gamepad is better suited. In titles like Cocoon, Hades, Death's Door or Tunic, the twin stick layout and analog movement control simply feels better. Dave the Diver and Dredge were fun with a controller. Anything retro or having platformer gameplay, I reach for the gamepad.
A few games I found myself switching between input methods, which was a bit weird but ultimately worked well. In Days Gone, for example, I'd grab the controller when I was riding the motorcycle, but switch to KB+M when I got to my destination and started walking around or engaging in combat. In Witcher 3 and RDR2, I did the same thing with horse riding - or if I was just wanting to decompress for a bit and take in the scenery. The lower camera movement was just a bit more relaxing when I was cantering around Toussaint or riding around looking for rare wildlife targets in RDR2.
For racing games, it genuinely depends on how lazy I'm feeling. I have a full wheel and pedal setup, but I'd be lying if I said I hadn't also played and finished quite a few races with a controller in games like GRID Legends, or the Dirt or Forza series titles. Pacific Drive, which isn't a racing title, but does involve a car, didn't work for me in either controller-only or hybrid switch style, for whatever reason. I changed back fully to full KB+M after a few hours.
FPS or action heavy 3rd person games? All KB+M, all the time. Strategy/RTS games? All KB+M.
It's nice being able to just use whatever I feel like, even if I don't end up sticking with it. What bugs me more is the occasional game that doesn't allow that sort of flexible input switching, requiring a restart or whatnot. Rrrr. <shakes fist>