Yeah for those people, they would need a beefier phone. That's certainly not me, I have devices at home. In my case, a pure dumb phone isn't of much use to me either, I make maybe one or two phone calls most months, but I've always used my phone as more of a borderline feature phone.
>a full PC or larger phone/tablet for ticketmaster.
The problem with ticketmaster is that you need to use it at the events themselves. Most events no longer use physical tickets. But a stronger phone or tablet won't help you here. Even on a high-end phone, ticketmaster will somehow forget to store your login information while you have poor network connectivity due to tons of people in the area, even if you try to load your tickets ahead of time to avoid the issue (although somehow they always deliver ads!). Everyone complains about ticketmaster's fees, but the app is the worst part.