Honestly love them and dont see the issue at all.

Have seen a few people bootstrap themselves with POD and then move into traditional publishing.

Demanding people keep a massive stock of something just in case you want one is the height of privilege.

I suspect there are real quality differences between PoD books published through Amazon and these ones, which may be printed in a similar method but perhaps not the same quality of electronic formats.

My self-published books via whatever it was called before being subsumed under the Kindle brand seemed decent enough quality, but I have received others from Amazon that were pretty bad (photocopy bad, for example).