Why does the phone at the gym bother so many people?

Are the majority of people on their phones actually just sitting on them for 20 minutes? People make it seem like that's the case, but even then...I feel like that's the minority?

I log every set of every workout I do, and set a 3 minute timer after every set, but there seems to be a large group of people that just assume everyone on their phone is just at the gym to socialize and hogging machines.

It's 2025. We don't need to just sit there and stare around the gym between sets, it's okay to use your phone.

But yes I totally understand there's a small subset of people who sit on their phones for long periods.