Agree, I was forced to use Netflix via LTE in Germany at one point as the WiFi on site was so bad and accidentally startet a 4k stream. Wasn't so bad at all, as compression, codecs, audio etc. all have to come together to get you to ~15Mbps. If it's a fairly good codec and the pictures are good to compress I'd guess with stereo or a reduced audio band you can get it done with around 3-5Mbps. Add in caching etc. and you won't get near the expected numbers :)