Loss of quality is probably down to being Bluetooth, unless streaming in aptX HD. An amp would probably improve that slightly, but adds complexity.
In terms of streaming services, I've gotten rid of NOW TV for numerous reasons, such as adding adverts, wanting me to pay more to remove them. Netflix will be gone by the end of this month, nothing they've released recently justifies a 14%+ price increase. That leaves Amazon Prime Video (never use the music as I don't like the interface or other functions), Disney+ for the family, Apple TV, Apple Music (part of my EE mobile package).
Interesting topic on the MQA side of things. However that surely requires the end user to actually have the sound equipment to be able to truly enjoy anything that emulates the original sound reproduction quality? I've literally just ordered some new headphones for listening to TV quietly late at night, not even sure the cans I've got coming would enable me to discern the difference in quality.