I think the Fusion Core system currently in the game kind of svcks, because obviously the intention of fusion cores and armor damage was to make power armor extremely strong, but also give it a downside that makes you not want to use it all the time. That doesn't really happen right now though. The armor damage just carves into your town building since steel is a major component of damn near everything, and the fusion cores aren't really an interesting mechanic for power management, they are just batteries you have to constantly collect. They also just don't really provide a satisfying answer to "What is the limitation of power armor?" because you don't actually have to do anything specific to earn the continuous use of your power armor, you find the cores no matter how you proceed through the game.
I would really prefer it if they gave you more options for how to power the armor that make a more critical impact on how you play. For example, having the ability to build tesla towers at your towns that provide wireless power in a radius like artillery provides access to barrages. Or having a heat buildup mechanic where your suit slowly overheats when you run and jump and jetpack and you have to balance your movement with rest periods to give it time to cool down again. Maybe you could have the ability to recharge the suit at generators. Overall there are tons of ways in which they could have made managing the suit more interesting and engaging than simply slapping a timer on how long you have to pick up another core that is relatively easy to stay ahead of.
Overall I really love how they made power armor feel like it really is incredibly powerful but high maintenance, I just wish they had made the downside to power armor a little more something that you feel as you're using it, like overheating or not being able to fit into certain places, instead of simply having a consumable item that affords you X amount of uptime.