Confused on wiring. 1964 Barracuda.

Well, I mean, if I have no interior lights, I guess technically there's no reason to leave them connected. The only thing the door switches would be used for is the seat belts on the Sebring convertible seats I installed. My light switch does rotate. Like an on, off click and then I presume brightness but I thought this would be for the dash lights. Is that incorrect?