The Extreme does not do gap-less playback...how on earth are you possibly going to listen to The Wall or any other concept album.
Years ago I was an early adopter of Plex (lifetime member), got all excited and ripped all my cd's and went to play The Wall and found out no gap-less playback. Got my cd player back out and that was the end of that. They had a workaround for that through a very poorly implemented theater app that they discontinued. Thousands of requests to add the feature from paying members and nothing but the finger. Been a few years should log in and see if they added it...yet.
Glad Emile is investing the time and effort for that to be a reality, its part of the artists intended listening experience.
He seems like a stand up guy / company.
Just to clarify, TAS does not do gap-less playback. Roon does and so will XDMS.