Removable batteries would have made this a non-issue. But Google is obstinate.
But even that is a bit of a workaround.... you would have to haul around a spare, have to manage charging two batteries (or have an external charger). A removable back plate does allow for EXPANDED battery support, since it can include a new backplate to account for the size increase. Removable batteries do add a bit of complexity and cost to a phone's design, so perhaps this was a beancounter sacrifice.
Still... up until a couple of weeks ago, I would have dismissed battery complaints a bit... but I used my JUMP to go from my Nexus 5 to a LG G3 (because upgrade).... two weeks in, I've noticed that I'm no longer watching the battery indicator... and I'm not in BBS or GSAM all the time trying to find leeches. I'm seeing idle battery consumption drop to below 1%/hour (from 2-4%). I usually needed to pop it on a charger at work, then at night, where now charging is a once a day thing unless I want to top it off. So now I kind of realized how much time I spend fussing with the phone in an attempt to squeeze what I could out of it.
I think it was most noticeable when I had to take a family member to the E.R.... We were there for 6 hours and I was on my phone quite a bit, sending messages home to give updates (everyone is fine). I unconsciously grabbed my wall charger when I left. Had I still had my Nexus 5, I would have been looking for an outlet at some point (which would have been a challenge, ERs don't really want people plugging random stuff in left and right, not a lot of outlets that don't say "Emergency Use Only")... but as is, I never once worried about killing the battery. It was at that point when I realized how much of an achilles heel that battery actually was.