Midland
Finningley MATZ was smaller than the proposed class 'D', plus it was normally only Mon-Fri 8 - 5 instead of H24. As most GA operates at weekends now you see where the concern comes in.
IO
ATC responsible for terrain separation whilst vectoring, hence you won't be vectored below MSA. As for aircraft separation - airspace type / service type / flight rules apply (though over control in class 'D' is not unheard of).