eBike technology explained

Hey everyone!

I've been thinking a lot lately about how quickly eBike tech is evolving, especially when it comes to the components we rely on for maintenance. Things like motor types (hub vs. mid-drive), battery management systems, and even advanced displays with diagnostics are getting more complex. For those of us who like to do our own repairs or just understand what's going on under the hood, what's one piece of eBike technology you'd love to see a really clear, "for dummies" explanation of? I'm particularly curious about the intricacies of mid-drive motor diagnostics myself, especially after a recent error code popped up on my Trek Rail!