I've seen and heard some YouTube videos of systems that appear to be quite high quality, this makes me wonder if they can be useful regards making assessments mainly of the sound of speakers and perhaps more to the point their interaction with the room?
Unless you have a set up exactly the same room, you would never know what you would get. I use studio grade IEMS when watching these videos, it’s almost pointless to make an assessment: you hear sibilant components, that in person, do not exist. Furthering, you are hearing the recording of the room, plus the original recording environment.
When I attend an audio show it’s also the same thing. I’ve heard products that I know are way better, but the setup, the source and the room are ruining the performance.
Just my long-winded $.02.
Cheers,
Greg