I 100% disagree with you. MusicCast compared to HEOS is amazing.

On HEOS: besides no Apple Music it also has no Airplay. So some people that are in the Apple ecosphere might not have any options under HEOS at all.
And last I checked, MusicCast had more service selection that HEOS; so not sure where that came from.
[edit]: Posted while I was typing, you must not have used MusicCast in "YEARS"!!! So I think your opinion needs to hold off until you try something from MusicCast a little more current (a lot more current actually).

HEOS = Network problems, setup problems, etc. Had 2 customers that outright got rid of them (lucky I didn't sell it to them). Both of those went to SONOS and were happy. My HEOS demo unit, gave it away to in-laws after I decided I would never sell it.
Nothing wrong with HEOS sound quality.... when it worked.