As anyone who has played against me might know, I’m not a “Top 500” player - far from it. I like to think that as a gamer, my aim is above average, but I’m not quick enough to dominate Vassili (or main Widowmaker if that’s your game).
Personally, I do find value out of using ADS (weirdly, I have it set to “Toggle” in most games, but you should ask me about my non-standard keyboard mapping at another time) for medium-to-long ranged encounters, but only if I’m not taking damage, or if I think I can win the 1v1 versus a ranged opponent. In close-quarters fights, you’ll need the faster move speed over the tighter bullet spread.
Nope. You’re not making any modifications to game memory or game code, so you should be fine.