In a lot of cases, a rework isn’t needed. Mercy is a great example; there are several suggestions in the megathread (that have gone unread) to nerf mass rez without removing it or to nerf tempo rez without making Mercy even more boring. Sombra is also a good example. Some players are calling for her to have a rework, but we don’t even know how strong or weak she is because her kit is so gnikcf inconsistent!