That would require more input from MS than they currently seem willing to invest into this venture. And maybe they even have some measure of comparison by the sales numbers of the Maule and the RV-6 on one hand and those WW II drones on the other. Reducing it to a simple question of a cost benefit analysis, selling the bare outside shell of a plane without having to do countless expensive hours of programming the intricate cockpit details and still be able to sell some thousands of those crippled planes may make sense to them.
Sales would have to be compared to the other version of the product (a warbird with a cockpit, in this case, covering the same sales-period) to actually form a valid assessment of which version the customers prefer.
Kinda reminds me of WW II Soviet war industry where they sent new tanks to the front with wooden crates instead of seats for the crew just to roll them out in great numbers ... Now don´t get me wrong, I´m far from comparing MS to the USSR but still their five-year-plan might need some minor adjustments