Are we not spose to fully charge our 13 minis? I ask cuz i used to run to like ~5% and then charge but not unplug till it was back at 100% this worked well of my last SE even tho people said i was "doing it wrong". Why cant the phone itself know the best defaults, or is it planned obsolescence? Serious question.

It is not planned obsolescence, just that in the case of a phone, having it at 100% when you are out and about might be worth a shorter life for the battery.

I am mostly speaking from experience with EV batteries. The most wear happens in the top and bottom of the battery state. The battery will last the longest if it sits around 50%.

This is true of Li-ion batteries in general.

I also use the shortcuts app, but since I dont have a smart outlet it just send me a notification (on my apple watch) when battery charge is above 80%. I also have another shortcut to notify when battery is bellow 20%.

Many people charge overnight while sleeping, so that would be really inconvenient.