Regarding backing up, yes it would be nice if you could backup your eSIM alongside the rest of your phone contents, however the real solution is just making it easy to provision a new eSIM.
In my experience, if I need a new eSIM I just open the carrier app and reinstall it to the phone.
Last month I reset my device to reinstall macos and selected log out of icloud and wipe. I assumed this would remove the activation lock but it did not and I had to put my password in. I've found that removing activation lock is an intentionally confusing and misleading process. This only exists to create ewaste and pad the bottom line.
I might want (and have wanted) to reinstall macOS and start fresh without any intention of relinquishing or transferring ownership of the physical device. And I might want to log out of iCloud because I don't want to sync my personal stuff on that computer anymore, or because something funky is happening with how messages or photos are syncing and I just want to reset it all. I'd be pretty pissed if, six months after reconfiguring everything, someone nabbed my laptop and I discovered that activation lock had been automatically disabled for me the whole time without my explicitly doing so.
Given these mutually irreconcilable user expectations, I can see why Apple would opt for a design that favors the more cautious approach where you have to press a very specific sequence of buttons to disable the lock. Maybe I'm just selfish, but knowing a laptop I sent away couldn't be repurposed but ended up as e-waste would make me feel a little guilty, but knowing a laptop I didn't want to lose got stolen with all my stuff on it exposed to the thief would make me apoplectic with rage.