Quote Originally Posted by Alfonse Reinheart View Post
Yeah, that "hitch" is what makes it not backwards compatible.
At this stage you come across as though you're just looking for excuses to be disagreeable.

Were VAOs backwards compatible with client-side arrays? Is glVertexAttribPointer backwards compatible with other gl*Pointer calls? Do VBOs modify the meaning of all gl*Pointer calls?

It doesn't need to be backwards compatible, it's modified behaviour, a simple glEnable is all that's needed to tell the driver "OK, I'm using this modified behaviour now, so if I call glBindSampler (31, samplerNum) don't assume that you need to fix up the world-of-crazy I've just fed you but give me a nice clean error instead".