Ironically, this is the result of various people at Microsoft at various times declaring "we need to scrap all this shit and start over"

There's some logic behind each, but each time assumes they don't have to do anything to port forward the previous approach to new UX standards as those will just die out. If it was roughly 13 screenshots of different developer experience, but consistent looking and behaving UI for the actual user, everyone could just shrug, maybe developers getting a bit grumpy about Microsoft's inconsistency.