Battery power for musical devices isn’t something that’s very important to me. One, I’m largely music room bound and, two, the issues of recycling and obsolescence are something that bother me quite a lot. I have many devices that people have given/thrown away because the built-in battery has died and they neither have the skills or inclination to try to fix the issue.
For things that do need it - field recorders would be pretty much my only example - I prefer not to have a built-in rechargeable battery. I’d rather use standard replaceable rechargeable batteries. That way, if I do run out of power at an inopportune moment I can relatively easily carry/buy replacements rather than try to find a power socket.
Devices that accept a wide array of powering options thereby suiting the use cases of as many people as possible are good though. I had a MOTU Traveller at one point. It could pretty much take anything short of plugging it directly into the sun!