[Creeker]

With experience you soon learn what is needed vs what is wanted.
Your preferred style of camping/traveling dictates that.

Personally, I don't need or want an EMS or Battery monitor.
I own much more accurate fluke multi meters with decades of
every single day experience using them. I need a good battery bank and inverter but have no need or desire for solar. Because of where and how we camp, an inverter style generator is a much better option for us. We have absolutely no desire for Satellite TV but do need Bikes, racks and inflatable Kayaks....

Its different for everyone and totally dependent on your experience and preferred camping/traveling style. Fulltimers, long term travelers and weekend warriors all need/want different things.