maybe the fuse is on the edge of the schematic and the cost-cutting team figured out how to hold it just right during the 'glance approval'.\
depends on how their assembly line is setup, potentially it could be manufacturing cost if there is like a work station where one guy does some parts and another guy later does the other parts.
also a chassis mod like a drilling operation is alot of exposure and time (make the guy a marking jig, mark, drill, drill again (enlarge), debur, make sure you did not mess up the chassis, buy a drill for the worker, get the worker keys so he can tighten the fuse holder insert, have him tighten it without scuffing the chassis, insert fuse, tighten, green loctite maybe saves a second). Do their other models have a fuse holder thats externally accessible?
They might be able to ask the manufacturer but it looks to be plastic so you need to do shop work on it.. even so they sometimes don't like to change cad drawings and stuff.
After a line is 'running smooth' for a while I expect they don't like changing anything because its a fine tuned money making machine at that point. They want to remove steps more then anything. In certain setups they want the most zombie like worker possible. And they can pay less because its less skilled then the guy next to him doing two more steps. "we don't need such a high skill level for this job (the other guy that does the higher end station with the drilling step for instance)'. Having two concerent processes of different 'quality' might allow them to make a mask to pay people less.