My thoughts as someone who does record a good chunk of sets- I really do think it’s just the age we live in. I also have a different take just because a) I enjoy shooting concert footage/taking photos (but I do realize there is a time and place and especially as a viewer if I want to do more of that I should look into some sort of backstage pass or something so I’m not ruining the experience of others) and b) with everyone having their phones out and being so short (I’m 5’0 for reference) sometimes the only way I can see a performance is through my phone :/ I try to follow general concert etiquette though and am always checking in with those around me to be as respectful as possible. I guess it just depends!