I work on an application that went through multiple iterations of UIs. Each superseded the previous one and a new admin UI was built into them. The oldest one was using Flash.
Occasionally I still have to drill down through four layers of "open legacy UI here" to get to some obscure, long forgotten setting. Manipulating shit with half-working elements in a VM running a flash-capable browser. Day to day I just go back one iteration though, because the admin UI has everything I need there. Unlike the latest iteration.
Some day we play on killing off the flash UI version completely. We already have planned workarounds in place to manipulate those obscure settings through endpoint calls. Won't be missed. But I'd miss the second to last admin UI that has everything where I need greatly.
This is what ms is killing off now. A good UI in windows where you can find everything. And all it'd have taken to make it better is give it a robust search functionality. No one cares about going back and forth in convoluted loops between sleek UI pages. People that care to manage stuff in windows at depth will be forced into shallow shit.