In the cab of a diesel, there is only so much "real estate". GE and I am sure that EMD both had people whose science was human factors, body positioning, etc. So I am sure that both builders "did the best that they could do" with the space they had to work with. I think it was easier to send seven astronauts to the space station than it is to get three humans over a 200 mile Division in a machine "with no steering wheel" in relative comfort. I believe that GE was told by the RR's to work through the unions to get the right people, so we had little choice. And of course there was (is?) the AAR/FRA "clean cab" committee, with their requirements. And we had to comply with OSHA. And of course railroad mechanical and purchasing was involved. So don't blame the "highly educated engineers".....
There is a lot of "fold down" stuff...the jump seat, the wash basin, etc. due to space and bump protection requirements.
During the early Dash 8 days, we were told to add a 3rd display screen at the helpers station to "give him information but restrict his options re operation", even though he never had this info before. This involved a lot of software to deny him the option to access certain menu items that are the engineer's responsibility. There were (are?) two screens in front of the engineer, and the displays could be switched if one screen failed. During the rollout, one Conrail train stopped on the mainline on Christmas eve, and the engineer did not know what to do so he put his boot through the screen. Then Conrail told us they wanted it replaced under warranty....
Well, you know how that ended up....
As soon as the warranties ran out and the railroads became responsible for the cost of the displays, all of a sudden we only had to install one!
I have stories about air conditioning and cab radios too, but this forum is probably not the place for them.