Seems like a pretty nice Docker-desktop-ish GUI to me. One remark: > Application looks the same everywhere, no mental mapping! That depends on your perspective. If you are on one OS and this non-natve-looking app comes along, you have to mentally map it for your OS so it's none-nativeness requires mapping to the OS-nativeness. If you, on the other hand, only work "in" this application and just take it with you regard…
Mapping different behavior between operating systems is much harder than mapping between native and non-native apps.
More importantly, however, working on : OSes frequently is rare. The developer of the app does it. I, as the user, dominantly use a single OS and want apps to be standard for that OS…