That's the beauty of HLS/DASH. Rather than just flat out stopping a la RealPlayer, they allow the video to continue until your network gets its act together. How is it the provider's fault if your network takes a dump for a bit?
If my network can maintain more bandwidth than needed for 1080p/4k most of the time (which it can) then there is no reason it should ever fall back to lower quality due to a short blip because you can keep several seconds (or minutes) of buffer.
For example I never have this problem on Youtube. Only Netflix.
If they can't make it work with 1/10th of that, that is their problem, not mine.
I would more prefer it would buffer more so it doesn't need to do either.