Did you set up as new or restore from a backup? From what you’ve said; I suspect you restored from a backup up.
I always set up as new. I upgrade annually. Have had the PM since they first came out so have a pretty good idea of what each model year has done.
I set them up as new. Log into my iCloud account to sync up that information. The log into Exchange to download and sync my email, contacts, and calendar. Then go to the App Store and download each app I still want. Getting all the apps back to where I want is probably the most time consuming part of the entire process.
So everything should be brought into the phone 'clean' as opposed to from a backup/ restore.
The 16PM was a battery sipper. I hardly noticed the battery meter going down. Anecdotally, I just notice it more so far with this 17PM. People's reaction to the 17PM battery life is how I felt about the 16PM when I got it.
It's 2pm right now and I'm at 57% after starting at 80% today with this being a pretty average usage day for me. The 16PM would be 60-65% at this point of the day for me.
As I said, not very concerned about it. 57% will be enough for me to get through the rest of the day. And I'm not even charging up to 100%.
Just sharing my experience for others. And would be curious if anyone else coming from a 16PM is having the same experience as me.
My main usage is Safair/ Chrome, iMessage, email, Podcasts (background). Also, I hate the new Battery usage section. Stupid that apple is giving themselves credit for screen on time while it's plugged in. Apple - if I wanted that info, I can go to Screen Time. On the Battery page, I want to know what my battery on screen usage is.