Amazfit Watch faces

I don't get why everything's so complicated...
Why not just let the app download the faces to the correct location on the band (without having to replace a previous installed face) so it appears in the Local band displays page in Mi Fit?
That's how the Mi Band 5 Watchfaces app works and it's great ...

You mean installed on your band or available in Mi Fit?
As far as I know an app can never see which face you have installed on the band itself because you can manually delete a face on the band and this is not something that gets synced with Mi Fit.
When I use the AmazFaces app and replace an ...