I’m surprised at the low number of votes here. There was a recent request along similar lines that puts it a bit better from my perspective: Plexamp stream to UPnP media renderer
In essence, this could make Tidal as widely useful and convenient as Spotify Connect.
I’ve linked Tidal to my Plex account and noticed that I can control audio streaming on other Plex instances (i.e. on my Android TV or tablet) from Plexamp on my phone. However, Linux desktop instances failed with an ‘unsupported at this moment’ message and I could not get anything to work on my Raspberry Pi streamer (the headless Plexamp doesn’t appear to work with newer nodejs versions, should it even offer this functionality).
At present, I use Bubble UPnP on my phone with Tidal set as the cloud Library source and I select one of my various upmpdcli renderers for playback (where this is installed on anything from a Pi to a full desktop). For info, upmpdcli is a UPnP Media Renderer front-end for MPD, the Music Player Daemon. It supports UPnP gapless track transitions and the OpenHome ohMedia services.
As Plexamp offers a much better user interface and as it’s clear that the functionality is practically there under the hood (as Chromecast is a basic, non-gapless, UPnP renderer that’s supported and I can only assume that’s how Plex clients communicate too), I’d much rather make use of my Plex Pass here 
Rather than develop and maintain a client/service for a number of operating systems, I propose opening up the ‘select player’ interface to include other UPnP renderers such as upmpdcli. I believe that distributions such as Volumino also use this renderer, so you can expect quite the uptake beside the DIYers such as myself.
Plexamp is truly beautiful. Add this one feature and you could probably ask Tidal for a bigger commission.
