The problem with 2.0 is that the world is changing, the goalposts constantly getting changed.
Likes are already obsolete with reactions becoming a thing.
SASS might become obsolete with CSS4.
2.0's theme is fairly dated for the present time.
PHP's likely going to go async in the near future (for significant speed improvements) which'll mean more changes to take advantage of that.
The idea of the monolithic five year project just doesn't work.
In theory, a 1.10 should do a lot better, as it just needs to focus on the here and now.