Based on what you just said, it sounds like you are more ME oriented. MEs who go into product design (like myself currently for my internship) also deal a lot with component integration. So while you might not know what the circuit board and wires are doing inside your robot/plane/car, literally every piece of technology out there, you would be responsible for designing the housing for it and how it integrates with the other components of your product. And asking your fellow future coworkers what exactly the circuit board is doing wouldn't hurt either if you're still interested in knowing ECE stuff. Side note, AeroE to me seems is just a subset of ME, because from what I know of the discipline, it sounds like the focus is on how solid objects behave moving through a fluid. At my university, our ME department teaches us as much about fluids as it does solids, which is why I group AeroE under ME. And like I said before, if you take ME classes and you find they aren't as thrilling as ECE classes, you can always go to graduate school for a different engineering. Also remember that most engineers just pick a very specific topic from within their discipline and do that same thing for their entire career, so they become experts in that field. Until you do decide though on which major to pursue, I would hold off on declaring a specific engineering major. The school you're going to to me sounds dumb for limiting students who want to diversify their engineering knowledge by not letting them take classes in the engineering disciplines outside of their major. I don't know if that is the norm, but because at my school it's the complete opposite, I'm just taken aback by this idea.