All to well I remember this typical issue with games, having different classes or characters and them having balance in story/campaign mode and PvP.
A good example have always been any MMORPG. People complained about a class being overpowered in PvP, steamrolling everyone. Eventually it got nerfed, maybe even several times consecutively. That however also affected that class/char’s prowess in PvE, as those nerfs also affected it in that section up to the outcome, where it was not very enjoyable particularly in PvE any longer, not to mention pretty underwhelming and frustrating.
I guess that’s why Blizzard skipped the story mode for Overwatch altogether and World of Warcraft now features extra PvP skilltrees.
Thus every nerf regarding PvP issues should also be evaluated PvE-wise.