in the context of having to leave the building due to a fire alarm, no, you're not meeting them back inside the building at the phone re-collection point (or in this case one of the phone unlock mechanisms). At least not immediately.
As I mentioned in another comment, it's possible you've never taken someone with a disability or social dysfunction to their first-ever concert, knowing that it's partly enabled by the fact that you can easily reconnect if you get separated (by the crowd, bathroom lines, a fire alarm, etc.) Take away that extra measure of safety and security, and the majority of people can "just deal with it", but people with certain disabilities or vulnerabilities are going to have to opt out.
Personally, I'd rather work to be inclusive. Use social norms, not technological lockouts, to get people to put their phones away.
As I mentioned in another comment, it's possible you've never taken someone with a disability or social dysfunction to their first-ever concert, knowing that it's partly enabled by the fact that you can easily reconnect if you get separated (by the crowd, bathroom lines, a fire alarm, etc.) Take away that extra measure of safety and security, and the majority of people can "just deal with it", but people with certain disabilities or vulnerabilities are going to have to opt out.
Personally, I'd rather work to be inclusive. Use social norms, not technological lockouts, to get people to put their phones away.