Atmos-for-the-home is a fad that's being heavily pushed by music studios. It makes total sense for movies (the concept of an object-based audio standard which gets rendered to however many speakers are in your theatre saves a huge amount of hassle on mixing and QCing dozens of mixes in LCR, 5.1, 7.1... 22.2, etc) but for most people who aren't sitting in a purpose-built listening room it has very limited utility.
If you've got a single "Atmos" speaker in the corner of your kitchen, should it really attempt to spatialise the audio coming from your shelf? Even if you put speakers all around your living room, unless there's a defined "centre" position it doesn't make much sense.
Headphones are even worse. Do you ignore head-tracking information (in which case the binaural downmix will almost certainly be worse than a properly rendered stereo mix - just switch from stereo to Atmos on Apple Music on headphones for an example - the stereo versions almost all sound better) or use head-tracking information in real time (in which case, turn a corner while you're walking and suddenly the lead vocal is coming from the left)?
Atmos/object-based mixing is a very sensible evolution in pro audio, for sure. But Atmos on an iPhone speaker is a weird bit of marketing that doesn't really make much sense...