Flashpoint and the return of Barry Allen in general made a simple thing more complicated. Unlike Hal Jordan, who had a death and replacement that was controversial, their really wasn’t much of a call to bring Barry Allen back for much of the 90’s. In fact the Flash franchise actually grew and matured with Wally in ways that it never did under Barry. That’s why their seems to be way more disjointed unease with Barry then with Hal. Their is a slight undercurrent of “was all this necessary?” With the Flash that doesn’t exist with the Green Lantern Franchise.
Another reason why one revamp seems better then the other. The Kyle Rayner revamp shrunk the Green Lantern franchise. Killed off several main characters, and essentially turned DC’s most prominent cosmic character into a street level superhero. The Flash revamp on the other hand actually expanded the franchise. Key elements like the speed force were added, and the Rogue’s were further developed.