"Boo hoo things just got slightly more difficult for me so I'm completely abandoning all effort to use the new system"
Quite some creators of 'gamemodes' for the old version seem to have trouble making their gamemode a real gamemode.
'This is because a gamemode makes you unable to select additional add-ons, which for many gamemodes, is a pain in the ass.
Most gamemodes are sort of supportive, they give the server owner a base to easily host TDM's and such things.
So i can see why some developers see this as a bad thing.
However, i do not think you should just think the old thing was better.
1. The crash/kicking out of own server issue will probably be fixed.
I mean, it is not really good for anything to leave that in, right? ;)
2. They didn't tell us about the gamemode idea, fair enough, maybe it was a good idea to inform us somewhat earlier, but it is not like they make it impossible for the old gamemodes.
3. I am not sure what you want to say with this, but if i understand it correctly, you think that they do not listen to feedback.
This is not true, they do, but they won't just change things back. They can however improve their stuff to make it work better (with other stuff).
4. Gamemode_Slayer will be updated soon for V21, just keep an eye on the modification discussion topic. ;)
The idea of gamemodes working like that is right, i can see why you think like that, but it will surely improve.
They are doing the best they can to listen to feedback and make changes/improvements wherever they can.
Just give them some time.