It gets better, Chrome is caching YT stream, but if you ever decide to rewind to already watched part it will forcefully re-fetch data from the server.
All chrome does is burn thru your SSD write cycles.
Date: Sun, 18 Aug 2019 17:20:24 GMT
Expires: Sun, 18 Aug 2019 17:20:24 GMT
Additionally YT token DRM makes the resources change URL every time you refresh (encrypted key) and on top of that force expire in ~5 hours.
I just tried random 1080@60 video and was able to rewind without refetching about 4 minutes back, more than ~6 minutes resulted in resetting progres bar (thin line showing already downloaded part) and re-downloading once again despite burning 100MB of it on my SSD for no apparent reason. I dont have to mention ~10GB of free ram just sitting there doing nothing.
All chrome does is burn thru your SSD write cycles.