Well, swappable batteries has the UX advantage of being able to swap in full charges.
I don't really understand all the complaining since it's merely a variant of the iPhone for people who prioritize thinness over battery.
For over a decade, HNers have complained that they don't want thinness to be forced on them and that there should be a separate SKU for it. Yet when it finally happens, HNers complain about the trade-off.