the only way classes like vegas can get on the sky is if they teleport through 1 specific spot, and it's in that double door area right next 2 the T spawn. there's no way you were getting picked off by vegas before you could leave your spawn, it takes them about 6 seconds 2 get 2 the spot, and get above it. and hell hunter can teleport by flash, but it's not a very fast process, and they only have dualies.
also there's that spot directly next to T spawn that has a roof over it, it's like what 1.5 second run to get 2 it.
I understand skywalkers can be frustrating at times.... but doesn't mean it should be removed. also, they have 2 be in a position where you can return fire, so really if you know there coming then just get ready for them and shoot back. or play an athena and freeze them.