Power armour use.
Initially in the game it was a bare minimum.
Later i started using it sparingly in radiated areas but would equip a companion in a frame.
At first i would maintain the companions suit but gave up after a while cos it was a never ending job and consumed scarce resources as they trash them in five minutes.
At a certain level I started to use it most of the time because I was coming across lots of enemies with skulls in their health bar and i just got used to wearing it.
Instead of health damage enemies would give me more armour damage.
i got into the habit of repairing, modding, painting suits .
I then went through a period of suit collecting and displaying them for the aesthetics.
After a while i tired of that and now the only time i enter one is to move it somewhere.
If I take one from a foe i order the companion to steal it and later on dump it at the bottom of a lake with all the other stolen ones.
I prefer the magic suits and hats that provide basic protection ( ballistic weave)
On the plus side you can easily cross water.
On the down side you have to descend carefully from height as you don't have the protection that power Armour provides..