I use ardour as DAW, but only for recording on Linux. It’s also available for macOS and windows. So you can check if it fits your work flow.
I mostly only use Linux, but sometimes you just need a program with out support. In my case it’s sometimes qlab, Linux show player is great(and I have used it for many shows). But it’s not feature compatibel with qlab
I’m in the same boat as you and never found anything for Samsung tizen os. Smarttube is android based only and anything streamed to a Chromecast still has ads.
Edit: okay I thought let’s search one’s more. And there is tizentube did not try it yet but seems promising