it and Kobo have REALLY poor User Interface and book sorting/organising features. I've got a Kindle and Kobo, I love the hardware and eInk. The software is terrible. We had better document organisation software 30 years ago.
Amazon's CreateSpace is a dreadful website.
Amazon KDP, Author Central and retail sites are terrible GUI / UX too.
They are good at marketing, not at software. I suspect the HW is mostly bought in consultancy?
Kindle Reader was based on Mobi and the eInk Kindle is basically a poor user shell on Android + Mobi Reader.
Amazon Echo / Alexa is totally creepy. No thanks. Ever!
One tech company I worked was just like what Amazon sounds like. Most somewhere between that and acceptable. Only one in over 30 years was "reasonable". Burn out was common. Engineers were thought of as something to be used up like laser toner. "We'll hire more"