When I first tried the new version I was most upset. Then I lost my consecutive play bonus and decided to quit WGT entirely. That didn't work but what it did was give me a break from playing golf online.
When I found that I would not be able to play PGA Tour 2K21 on my current computer I was lured back to WGT. I made a big decision at that time that has made all the difference: I wouldn't play the Flash version.
With time off and a renewed commitment to the game I have found that the new version is actually very playable as long as I don't touch the Flash version. This is the mistake that I think many players make; trying to switch between versions. So much of golf, both real and virtual, is based on habit. Playing the new version requires different habits from the Flash version. The people leaving don't seem to want to create a new set of habits in order to play the new version with the same fervor they had for WGT with Flash.
What these leavers have to face is that living with change means adapting. Coronavirus has done that to us in the real world. The new version of WGT has done that in the virtual world.