Aim Assist on PC

Why there is no aim assist on Overwatch on the PC when I play on the controller?
I don’t know why they did not add this future on the PC from the beginning until today.

I see a lot of games on the PC support the aim assist when you play with a controller, but why Overwatch?

because of the controversy that could ensue.
some people might have the idea that aim assist is a form of aimbotting even if it is used on an inferior peripheral.

Because you don’t need it if you just plug a mouse in.

I want that because I don’t like play with a mouse

If you play on PC and actively choose to use controller, that’s on you to work round your handicap.