Good points, but from a chemistry perspective, fast charging is detrimental to the battery. It would be more efficient to have two or three batteries standard charged to 70% that you can swap in as you go than have one that you need to repeatedly fast charge.

I argue that easier they make for user to swap batteries themselves, higher the demand for the batteries will be, thus lower their price.

> The needed mechanism and the protective shell the replaceable battery needs definitely takes up space

This is true

> The real problem I think is the hostility towards repair, glue everywhere, no spare parts, etc.

I think when a manufacturer isn't designing to allow a regular customer (the owner) to be able to replace the battery themselves, using glue and restricting spare parts is a natural consequence of financial realities: Most people are not going to take a $500 phone that has been used a few years to a shop that will need to charge $100+ in just labor to swap out a battery. So there's no incentive to have a bunch of spare batteries.

I'm a huge fan of user replaceable batteries because in addition of obvious benefits, you can also just remove the battery and power it simply off USB-C when running something heavy on the phone for extended periods of time. A battery used in that scenario wouldn't just overheat itself but stop the phone from cooling off too.