Adjusting the pads is a normal part of maintenance for mechanical disc bikes.
I have a tektro mechanical e-Bike that is ridden with rider+cargo > 200lbs 8 mi/day with 4 steep (> 50 meter elevation change exceeding 20% grade) hills.
I move the adjuster for the moving pad in one "click" weekly when filling tires and readjust the static pad monthly. Once I put down the $ to get a set of long ball end hex wrenches and stopped trying to work a mini bike multi-tool through the spokes to get at the adjuster, it's not really a big deal.
Moving pads in weekly or even twice weekly depending on just how heavy and hilly your idea of "very" is, does not seem extreme.