Bro, a lot of shit was still using NiMh batteries in 2003. I know a lot of the advancements haven't been very sexy, but charge discharge cycle count, energy density, rapid charging, high wattage discharge, these are all important. I'm going to stay hopeful.
The sodium 18650s are available on Alibaba for a few weeks :)
And for re-use my "extra" batteries are all interchangeable or able to be put to use elsewhere when the bike isn't in use. ( I've been considering an inverter for power outages).
I mean you personally may be able to reuse them, but most people just throw their old escooter (or whatever) away when they get a new one, or at best resell it or donate it.
Image how cheap a new ebike could be if you only had to swap the batteries from your old one