See recent work on Sony WF-1000XM4 [1] as an example.
[1] https://codeberg.org/Freeyourgadget/Gadgetbridge/issues/2925
I extremely agree. The fact that most people have phones nowdays is exploited without limits - what if someone just doesn't want to have a phone? Suddenly, a large amount of things are just unavailable for them. And that is considered okay because "nobody is forcing you to have all those things".
At least if having a phone was made mandatory by the government, the public could demand some kind of standards of privacy and security. This way, it's the worst of both worlds - phones are de-facto mandatory, but they're not officially mandatory, so phone manufacturers can do whatever they want because "nobody is forcing you to have a phone"... And all the other manufacturers can require you to have a phone because "everyone has a phone, duh".
Even worse is that the app appears to only be distributed on either the Apple or Google store - thus requiring an account with a third party.