Wouldn’t you be fighting against other PC players? Good luck attempting to fight kb+m players on joysticks.
I can play some other game on it as a handheld on the train and then dock it at my destination. A Steam Deck is also a really cheap computer that will still run most games.
Some gamepad player are really good. Especially in Overwatch, which has characters like Mercy, Moira or Reinhardt that can provide value even without good aim.
Though Overwatch doesn’t have aim assist on pc, so it’s probably difficult even for most experienced gamepad players.