Sir Swag spoke to a Blizzard dev insider who knew of the inner tourmil within the PvE team for Overwatch 2 and how management forced them into a vicious cycle doomed to fail. With this information it seems clear why Jeff Kaplan left when there was pressure to change his aspirational vision for Overwatch 2 and the franchise as a whole and it seems he got out before he had to lie to the millions of fans.
Sources:
SirSwag
OW2 2019 Announcment
Jeff final message
https://overwatch.blizzard.com/en-us/news/23665015/
BlizzConline 2021 | Behind the Scenes of Overwatch 2 | Overwatch
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