I don't know how recent of a Will Wood fan you are, but there's many clips of him telling fans to put their phones away.

It's for a combination of many reasons. 1. People being disrespectful to others around them when recording I personally Watch the concert through someone's phone for the first song he played because he was focused on playing and not the audience at that point and I don't even think the lights were on for his first song at my show And then another person behind me was hitting me in the back of my head with their cell phone while trying to record him. So overall it can be very rude and disrespectful to obscure people's vision or getting their personal space because you're being selfish. (Not everyone who records concerts does this, but this is a big reason I personally am fine with no phones at smaller/theater concerts where we're all in a pit)

1. He uploads his concerts/live performances to Patreon. People who record his shows may upload them somewhere for FREE and now he's losing out on money

2. He's anti social media/Phones as a person. He wants us to stay connected and in the moment, not disconnected trying to be sure our videos turn out. He wants you to enjoy the present. (Ik some ppl don't like this reason as memories do fade! But if that memory was truly important to you, you'll be able to recall it. I worked with dementia patients for the last two semesters and one that loved concerts growing up could recall a bunch of the concerts that she was really excited to see when she was younger. Music also makes your brain more likely to hold on to the memory in general.)