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Apple Music isn't the best streaming music service — it's just the least annoying
(www.androidpolice.com)
This is a most excellent place for technology news and articles.
I did say it had been a couple of years, and this was all true when I stopped using it a few years back.
1a.Car mode deprication in 2021 without a replacement at the time: https://www.theverge.com/2021/11/26/22803670/spotify-retiring-car-view-android-mobile-playback-auto-driving
Yes there's a global toggle, but if it is not to your liking, there's no way to take X song and boost it 20%.
Per device as in per-bluetooth, not per-app. When you have bad car speakers but good headphones you might want wildly different EQs.
If memory serves, I did try that. It still opened itself constantly. Most people probably aren't monitoring background activities on their phones, but it was like 15-30wakelocks/hr just to exist.
This was with hq on. And automatic adjustment off. I can't describe it other than flat and crunchy but there's something to it, or at least there was in ~2021