Then it must be that Naim can’t actually understand the music I like because the My Mixes feature has been available in the Tidal app on my tablet (or on my smartphone, or on my PC, etc.) for quite a while now.
Forgot to mention that I use a NAC-N272, should that make any difference.
I mentioned this to Naim a few months ago, and they said that they might be able to add it in future. No sign of this happening so far, but maybe if you send them some app feedback it will prompt them to do it.