I think in general not being able to replace the battery toolless is quite an acceptable compromise nowadays. The needed mechanism and the protective shell the replaceable battery needs definitely takes up space which can be used for more capacity instead. You have (sometimes quite insane) fast charging and also powerbanks which support it. Also quality batteries can be quite durable.

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

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.