TechCrunch received a statement from Apple that intends to take the focus off describing the feature change as default music service support and instead on it being a part of Siri intelligence:
For example, if you tell Siri to play a song, album or artist, it may ask you which service you want to use to listen to this sort of content. However, your response to Siri is not making that particular service your “default,” Apple says. In fact, Siri may ask you again at some point — a request that could confuse users if they thought their preferences had already been set.
Apple also points out there’s no specific setting in iOS where users can configure a “default” music service, the way there is with email and browser apps.
Apple lets users set default web browsers and email clients in iOS 14, but Apple is choosing not to offer this same level of control over audio clients yet.
Seriously, don’t call it default music app support in iOS 14, according to Apple, because it’s Siri-based, which means it’s much more nebulous than a simple setting. Actually, we can just call it that going forward: nebulous Siri audio feature.
iOS 14.5 is currently in its third beta version. We should have a clearer description through release notes when the upcoming software update ships later this month. In the meantime, you can keep default music, audiobook, and podcast apps on your wish list for iOS 15.