Reasons I can think of why someone may want to get something else may include:
No balanced outputs
Qobuz support
Lack of display/touchscreen (only available via the app)
Looking for some ‘high-end’ DAC
If you want a traditional volume control knob and not buttons.
Don’t want to be tied to the AxiomAir App (you could use Spotify almost exclusively via Connect though)

I believe the whole App is being completely rebuilt and there is talk of Qobuz support. So that might mitigate two of those reasons...