Short answer, Premiere pro is antiquated, it just doesn't know how to use your hardware at full potential and probably never will, there is no serious competition and it will never get updated to use newer hardware properly. People are lazy and most of them got used to premiere, there are alternatives like Davinci Resolve but the learning curve scares most users and they stick with Premiere, this means there is no point in throwing money if it sells. At some point someone will say to you the MEDIA IS VERY IMPORTANT, h264 is very intensive on the computer and that's why even 28 cores won't do it, Nvidia 2080 ti it's not enough, 64gb ram is minimum for 4k and all that crap. Well, it's not true, it's just premiere pro's fault, you can cut A7 III files perfectly fine on a tablet like apple's ipad pro, or davinci resolve with no need for transcoding. If don't want to learn another NLE then suck it up.
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