Indeed. The reply from B&O was "Please be informed that the battery is needed to be able to turn on the Beoplay H95 due to the DSP or Digital Signal Processors technology on the headphones. Therefore, even if the line-in cable was connected and sending charge to the headphones, a working battery would still be needed." And I think that is an ok compromise and I'm happy with that.
I agree. And I recommend trying the H95 with the USB-C cable, since that involves one less step of loss. In comparison with the 3.5mm wired mode, for me the USB-C mode has both an even deeper base, more slam, a fuller mid, as well as more volume (probably to do with the power being fed through that cable). For me the 3.5mm wired mode only removed the bluetooth step of loss (I think the H95's onboard DSP doesn't allow it to take full advantage of amps/dacs) but the USB-C mode really made it on-par with some of the mid-level wired Planars. If I have to give a hand-wavy rating, *for me* the bluetooth is 6.5/10, the 3.5mm is 7/10, the USB-C is 8.5/10, the USB-C + EQ would reach 9/10.