Yeah, it's a real pain in the shorts. But, the impetus was to make a Fender "Starcaster" body available, and those didn't have access panels. At least, that would be my excuse if I were Warmoth.
One could argue that it's an aftermarket part, so all bets are off. Do what works; to hell with the original design. But, then you'd have the purists alternately crying in their beer or pissing in your cornflakes because it's not an "authentic" part. You can't win.
It's an expensive part to make, so if the bitching gets to be unbearable, they may change the design lest they lose their development investment due to poor sales. Time will tell. For what they cost, I wonder how many they sell. They may already be sorry they went down that road.