-- I don't have a phone.
"Put it in or you can't come in."
-- I don't have a phone.
"Last time I'm asking you nicely."
-- I don't have a phone.
"Ok, whatever, just go inside."
-- Takes out my phone and records Alicia Keys
-- Takes out phone and swiftly gets escorted out of the venue by ushers/security.
This isn't a policy happening in a vacuum - musicians, comedians, and other performers are taking steps throughout their acts to clamp down on phone recording.
-- Sure.
Continue to then use your watch to read email and record audio.
This is a tech race that Yondy will lose.
-- beep
"What's that?"
-- uh, nothing
"Ok sir, you're going to have to empty your pockets if you wish to enter"
-- puts phone in pouch
Here's the thing - you don't get to choose how others best experience an event. While filming it through your phone may not be the best experience to you, you're not everyone. People experience things differently, and their way of experiencing it isn't "wrong".