I don't really agree with Sids out look on kef BUT
I'm sorry there's nothing future proof about this product IMO, I don't by they couldn't get the app to work minus a few functions and they could have easily added tidal connect. The v1 of this product was out what 5 years, now you're pretty much left at the mercy of how long the app continues to work on the smart devices,
you will be lucky if you get full functionality out this product for another 3 years.
Yes you can add things to it but you'll never be able to set it up properly past a certain point. Its a shame
This is not a product where the out going model is a good deal IMO
For me, I wouldn't touch either of these, Id get the Metas with a nad 316bee v2 and bluesound node 1799 (or any dac of your choice and chrome cast audio if you can find one load's cheaper)- cheaper by a good long way then the wireless metas and should sound just as good if not potentially better and god will should last you a lifetime certainly an end game setup in regards to amp and speakers. Watch the John darko video on this its pretty much his system he used to test the passive metas.
Digital tech is just moving along at such a rate of knots and with all the will in the world, I couldn't tell you to spend over a 1k on a streamer, the blue sound is as much as id spend currently on any streamer.