“Parkour” is only a utilization of an ability NOT a main focus of her speed, there has NEVER been an outcry from the community in regards to her speed during stealth, the devs just got rid of it because they made invis infinite. Like I stated before re-positioning, escape, flanking, scouting, and stealth purposes are the main reasons why speed is pivotal to her kit and must stay.
Having additional mobility for a small amount of time doesn’t make the main focus of the speed ability to run and jump around on a few things. It doesn’t put her on par to Lucio, Genji, and Hanzo’s mobility, these maps aren’t solely built with nooks and crannies only Sombra can get to that makes her faster mobility such a game breaking ability.
Plenty of other heroes can utilize their abilities to reach obtuse places, Pharah can fly where ever she pleases should we get rid of that? And when Lucio is boosting the team Everyone can “parkour”.
Revert the speed changes and everyone goes home happy.