Well done. Really smart reply from your side. To call others dumb just based on your own assumptions and opinion is indeed the smartest thing to do.
This is simple. About having the phone in the same room, you make an assumption that people only stream music from their phone. Which is basically unfounded as you have no statistics on that.
Then to rely on the phone's battery? Same thing happens with a sonos system. If my phone or computer's battery dies, then it stops playing music as well. I don't see what's your point there to be honest.
If all the "smart things" you say are documented, why don't you take some time to post some articles here about it?
And as I've mentioned before, despite knowing all the tech bits behind bluetooth vs wifi, most people, including audiophiles, can't always tell the difference between the two systems. But probably it's because I'm not a mega ultra super duper genius like you. I'll try to read some books so I can one day be 10% as smart as you are. Thank you for educating me and making everybody else smarter.