Not to be patronizing but it sounds like you don't have much experience with work boots or jobs that actually need them. If a driver spends their time going between relatively clean locations then yes, it's a relatively trivial complaint. The problem is that's often not the case: If they have to visit remote, heavy industrial, or some types of farm locations their boots will constantly end up caked in mud, random chemicals, or various biological debris. As someone who has dealt with all of the above, I find the complaint about door placement to be every bit as big a deal as having to get out of the seat at guardhouses.
Fair enough. TBH, a lot of it is that I just misunderstood him. I get the concern that this will spread the dirt over a larger area, including some of the space that really should have been usable for storage. It looks like a bad tradeoff in several important ways.
