I'm actually okay with the check in system in theory.
But a few things need to happen.
1. The information needs to be posted on band social accounts, with instructions emailed at the point of purchase on when and where to look.
It would be preferred if someone from the livenation team was in town to help. It's not as if they can't afford it. But at the very least, sanction the specific check in system and post it on official channels (not some random, unaffiliated fan run Facebook group)
2. No reserved spots for "line runners." This is horse shit. This is where people get pissed, when spots are saved for people who aren't even in the state because they have a pre existing relationship with someone and agree to hold a damn notebook for a few hours.
If you're going to be a line runner, you need to be in town when the list starts. If you're coming from out of state the day before or morning of, tough. You get whatever number you get. If you're truly doing this because golly gee you just love the u2 fan community so much, then you won't get too butt hurt over dropping back 100 spots because you weren't there when the list started.
3. Day or show the band and venue need to start distributing wristbands at 8 am. I know this happens at a lot of venue's, but it needs to be official and uniform across every show.
Instead of wasting money on a dopey AR app that is used for one song, why not develop an official U2 GA app. Push notifications on check in location, scanning a bar code to check in and get your number (eliminating the need for wristbands).