You still don’t quite get the problem:
to add something small most Hero’s played right now are countered by Sombra which also is a reason for her Pick-rate to rise (basically the Meta that is forming is strongly favoring her)
This is a quote from my other post and the reason she works for you judging from what you said you are a GM player (normally) that’s why you can bring her to work. And why anyone who is not as skilled as a GM player can’t. You will not be able to play her the same at ranks with less teamplay (Master is still pretty ok with team play and most of them know how to play with a Sombra).
I don’t even want big changes better Visual (on hacked targets) and an Increased movement speed (fix her thousends of bugs obviosly) would probably fix her and make her viable at around plat but it probably would make her even stronger at Pro and GM (or better said in Pro or GM hands at a Rank with decent Teamplay).
As someone who plays at platinum not because I can’t climb but because I think Platinum is the best and most fun Rank to be in (this may sound like I think of myself better but this is actually how I feel and how I want to play) I still get a lot of hate and a lot of looses because I’m useless without follow up.
I hope you can understand that I can understand your point too but I still think that it won’t be possible to have her balanced with Infinite Stealth because of the reason’s I already mentioned.