When is hardware acceleration not going to be restricted to very specific circumstances?

I use premiere pro for contant production on a semi-regular basis. Some of my bigger projects take a while to actually render and/or exhibit bad timeline performance due to the lack of hardware acceleration. My question is, when is hardware acceleration not going to be restricted to very specific circumstances. That is, unless I'm doing something wrong, but a lot of my research point me to the fact that dedicated cards can't do hardware encoding, because reasons