It's still a good idea to have your main music library in flac for future proofing, but yeah 128kbps opus or ogg is what I use on mobile devices.

My hearing isn't extraordinarily acute, bit I can hear the difference, especially in transient-rich sounds like cymbals.

With quality headphones, back to back, I'm confident that you could

And even if you can - is it worth it? I mean - do I care and should I care? Is the point of music detecting every detail of the recording or can I appreciate it without paying that much attention to production? For instance, I find it much more convenient to use Bluetooth headphones as it allows me to move around the house. Flac immediately stops being relevant, as Bluetooth codec is really bad compared to almost any codec. I recently tried ldac codec on my headphones - couldn't really tell the difference. Mp3 128kbps is just fine for me. Almost any situation. I care about musical content much more than production details. Other people might care more. I don't.