I have a Bluseound Vault too but for the last several years use it as a hardwired backup streaming source to my ARC/Wilson system (when Roon goes down- which it does about once a month for an hour or two) I flip over to the Vault and access Quboz and Tidal. It does a decent job but if you have a nicer system then I suggest a better streamer/DAC - it'll make a big sonic improvement. I default to liking the selections of Quboz - Tidal is still skewed toward explicit lyrics / rap etc but has overall a good mix. Sonically I can't tell them apart by the way. And, with a hardwired system the issue you raise about FLAC is moot. I bougth a Lumin PI for my main streamer/DAC and love it. It also gives access to Spotify, which the PS Audio DirectStream Jr I had previously did not.
Tidal FLAC vs. Qobuz
Does the recent change by Tidal, from MQA to FLAC make Tidal the better choice for streaming? Or, since Tidal only seems to offer FLAC on its own app and not the BluOS defeat the purpose since you need to transmit by Bluetooth instead of ethernet?
Currently, I stream from Tidal over direct ethernet cable to a Bluesound Vault streamer, to a McIntosh amp and Revel speakers. I have a trial membership to Qobuz but I find Tidal has a much better catalog. Since Tidal added Flac I thought it would be the obvious choice moving forward, but isn't the point of FLAC defeated since you need to send wirelessly from the Tidal app over Bluetooth?