I can't find it now (I looked but search engines seem to have gone to shit) but many years ago I remember an article about Sony's addiction to non standard formats and it included a quote from a Sony person when the Ericsson line first came out. Basically Sony always wants to try and make things a bit different to give them more control, think Betamax vs VHS. They thought they where just better then everyone and (they do this a lot) assumed that their format would "win". The closest to the article I can find was in 2023 https://www.bwuphoto.com/from-betamax-to-cfexpress-why-sonys-visionary-formats-often-miss-the-mark/ but it is like 20 years later and kinda short without much value.
When they went to the silly phone screen size there was some meat on that idea however, they enjoyed a position as a major player. Sony expected phone apps and such would be made in their odd format and when that did not happen, just kept the format for longer then they should of. I remember having a Sony phone and almost anything you did outside of the web or home screen would just have black bars on ether side. I was always bothered by it but did not know why until I read that article (that now seems to be lost). The reason for these odd formats always seems to be nothing but control for Sony and issues for the consumer.
I can think of a few times Sony did this crap, Betamax, Phones, Playstation disks, CD-i, wierd audio compression tech, mini disk, digital cassettes and their own memory card format.
Any others people can think of? I am now on a bit of a orphaned format kick.