That's perfectly valid.I don't multiroom but from memory wiim devices either can or in the pipeline.
I've not used any BluOS devices but for my use case (spotify, qobuz and amazon streaming, digital into a dac/amp, controlled via phone /voice ) I wouldn't need to look twice at a Bluesound Node device now I have wiim mini.
But the poll question is confusing, IMO.
I do use BlueOS accross 4 rooms at home.
Multiroom is what I paid it for.
Except Sonos and Roon (which requires a dedicated PC), and maybe some other proprietary system, there is little competition for that.