Better multimonitor support, VRR, and HDR are some of the promises I think. I want all of these things but not enough to switch away from Linux Mint. I'll be happy when Wayland makes its way in over the next couple of years.
There's also the cost to transcode the video and audio streams into different formats so they don't have to do it on demand whenever someone watches a video. That's a lot of compute cost plus they have to store all of those additional transcodes which is more storage cost.
I'm not such a monkey, and I could probably contribute if I put my mind to it, but I just don't have the time.... Instead I try to contribute documentation and money when I can. Everything helps!
I have a Ryzen 3700x that had similar problems. In my case disabling Precision Boost Overdrive and regular Precision Boost eliminated the crashes. PB being just the regular boosting behavior of the CPU. With it turned off the CPU basically only adjusts its frequency between the idle frequency of like 800 MHz to the base clock (3.6 GHz or whatever).
I think basically what happened was the BIOS was running the CPU too hot and eventually it just couldn't stably boost to the higher frequencies which would cause problems. It's an easy thing to try and see if it works for you. In my case I was able to salvage the CPU by putting it into a server whose workload doesn't benefit from moment to moment super high CPU clock speeds.
Is a hamberder a question?