LaTriker, good question as to why they do things like that. Mechanics at the dealerships complain about these dumb builds too. We are not alone.
Just alter that cover to make it easier for yourself. You might be able to just leave it off.
I use an 8" marine deck plate that I simply unscrew to access my bypass valves. Its installed on the plywood platform that supports the mattress. It also allows me peek inside to actually view my water level in my tank for a real reading of my water level.
Happy trails, be well.