Thx for checking the record out!
As noted by the keen folks before, there is some best practices to get these things to work most everywhere. Regarding the LFE/sub, most receivers usually just cross over frequencies below a set frequency depending on how you're set up. Even Atmos mixes going through a sonos system do this by default even if I don't have my mix using the sub. I think this is a good thing for the playback system to be calibrated to the speakers and/or room for optimum playback.
Related fun fact, even when you play quadraphonic vinyl (all mixed, mastered and encoded in quad) through an surround/immersive receiver it can actually render out to as many channels as your receiver is set up. For instance, I once heard one of my quad mixes in 7.1.2. Though I do prefer discrete quad playback, it was surprisingly accurate and the vocal that I had panned to the phantom center was nearly perfectly discrete through the center channel. Very impressive how the matrix encoding and decoding holds up.
