Yes, the batteries in the fairbuds are standard LIR1054 which you can buy from loads of places. Not sure about the case but its bigger capacity so it doesn’t need to be replaced as often if ever.

Either way third parties could and probably will make replacement batteries for the case because there is nothing stopping them unlike apple devices. And the battery is still extremely easy to replace.

I agree that a 3,5 mm jack would be nice, but you are overreacting.

Oh no doubt, and this is definitely an audiophile’s phone. I just hope the benefit of the slight gains in quality outweigh the (imo) massive hassle of having the phone tethered to body.

My buds are sony wf-1000x3, been using them for years. Charge them once a day, use them pretty much all the time, no issues.