Am kinda disappointed tbh.

Like the bullying by the monsters + other fans has been so intense that some of you guys are scared to defend Katy now I feel. I can tell you right now I'm sure. Absolutely sure that she had a large portion of live vocals. Roar and Firework's choruses were live. Yes, the ones with those great high notes.
If you listen to the superbowl, you notice she has the exactly same inflections and vocal subtleties as her tour performances. Like I saw one cat say it was completely lipsynced. No, use your brain.

She mixed lipping + live vocals.
Anyway that's my mini meltdown.