A year ago I would have been absolutely for this. I mean I still had a smartphone with swappable battery (LG G4) 2015-2019 and only changed away from it because of the bootloop issues this phone had.

Though last year i switched to the Zenphone 9 and this phone has a phenomenal battery time in my eyes. I only slow charge it to 80% every 2 days and I could use the phone for more than 48h if i wanted. Fully charged i can use it for 3 days. I don't think i will see battery issues for a long time.

I could see that some future phone designs and technologies (like bendable phones) would have it difficult to include swappable batteries. I wonder if those could still use fixed batteries if they offer a free replacement each year or sth like that, instead. The USB-C changes are good for sure though