If I see a Widow in a match, as soon as I die, I find out where she is before anything else if she’s the biggest threat to me (hitting a lot of headshots, taking a lot of health off me, etc)
Nobody’s trying to try and give some sort of excuse to her being “overpowered”…Countering her in some way is literally the way that you survive against ANY character. If a Widow’s killed me, I remember where she was and as soon as I leave spawn, I make it a point to see if she’s still there. If not, then I find her and watch out for her until she’s killed.
I also agree that there absolutely are warnings; the ones you listed are perfect examples. I don’t think Widow needs to be nerfed but only because, in my personal experience, I haven’t had a hard time countering her in any of my games. It’s also worth noting that countering a hero does not necessarily mean you have to change the one that you picked. (Another thing is that I play on console, so, who knows, it may be much more frustrating on PC)