I’ve had an iPhone 15 Pro Max since October 2023. I’m happy with it and would like to use it for a few more years.
One thing bothers me a lot. The battery consumption of the apps and the fact that it keeps freezing and getting really hot.
According to the check, the battery is in normal condition and at 84%.
The memory is only half full.
What could be the reason for this?

Personally iOS seldomly betrayed me with it’s judgement regarding battery drain and the possible root cause. 🤷♂️ And there still is a difference between 5G with four signal bars and 5G with one. Not all 5Gs are built the same.
You can choose to ignore iOS analysis, but I think you would do yourself a disservice. That should be the first thing to debunk/confirm from a debugging perspective.