I havent updated to 13.7 yet, the one major thing I've noticed on my XS Max running 13.6.1 is - whoa, the phone feels much warmer...almost hot now after using some apps.
Even shooting photos/video for a longer period of time...it really heats up in the back, just around the top, camera lens area (not the camera lens itself I THINK..it's whatever is behind or near it).
I really noticed this last night. Also check battery %, after 5-6 min of use...I'm down 9-10%!
smh!
My iPhone 5, 6+...both of those seemed to start having heat, battery performance issues just before the new phone came out. (I had the 8+..but only kept that one year)
So..IDK, maybe this current XS Max, almost 2 years old again is pulling the same nonsense.
Im looking forward to 12 Pro Max, but it does depend on what I see in the Keynote, new features...etc. If I'm not blown away, I actually just may get last years 11 Pro Max..at least it will be cheaper. (I still like that Midnight green)