I don't understand your post I'm afraid. You mean you don't know how what is claimed? That it has within app control for all functions? Almost every single review and preview said you could control the settings with the fiio app. You can't, you can only control eq. If I recall the "manual" in the app only shows the on device controls, it doesn't say anything about what else the app does or doesn't do. Surely you find it strange that every other fiio dongle allows this and the new "flagship" one doesn't?
It is extremely clear that in its current form, this device is a step up in Hardware/performance and a step back in every other aspect. It is more expensive, larger, heavier, worse design imo (more glass for fake large screen, uglier - maybe others prefer it) no setting app support, no play pause, no skip track, no unfiltered mode. It pops on playing, and it's more power hungry.