LOVE their artist (Beiber fandom has faded these last 15 years). And the reality is that current popular artist concerts are propped up by incredible concert production (lights, sound, effects...). It's hard to do a bad show. My daughter and son saw Imagine Dragons a couple years ago and said it was the most incredible show. My brothers loved the 21 Pilots show for its sound and production.
The music: I've heard many TS songs in my travels with my wife and daughter. Like a Michael Jackson or Madonna, she's got some catchy stuff — stuff that even I can tolerate or even enjoy. I'd say that she's the MJ for this generation of millennials/Gen Z — which is huge.