Lets hope Apple will be as aggressive about being everywhere as Spotify is. That's their only way to make inroads against Spotify. The only condition in which I'm leaving Spotify is if I can seamlessly throw music to any device in my house, like Spotify can while enabling the level of remote control Spotify does.
The most important thing in the Spotify product is how brilliantly its been engineered. They've taken a function over form approach and my entire family loves using it. I'd love to leave Spotify, but Apple does not have the functionality Spotify has and Airplay is not the answer.
There's something that Airplay does that is just too close to the system level. I cannot stand using it because I have no idea what I do on my phone will disrupt the playback on where the media is being played. The system volume controls are hijacked and I can't stand how when I use airplay for lets say, Disney+... I can't continue to use my device for anything else. I can't just toss a movie on my TV for the kids and go back to work with my phone.
Spotify lets you just pick a device signed into Spotify and leave it at that. There's none of this messy intermingling of my phone trying to figure out what I'm trying to control.
If Apple wants my business they need to figure out Airplay or do cloud based client session control like Spotify, and it needs to be available everywhere.