With respect for the MDA flyers I think that 3° descent is the only way to "standardize" the general XX company for a safe and stabilized approach.
This conclusion comes from many years of CRM & studies of pilot technique on NPA.
It is not wrong to use MDA level for a look but it is "recommended" the std 3° calculation (if the Jepp. chart doesn't depict DME/alts).
We can continue speaking a lot about IF .. Then... but the calculation of fuel should include allowances so it not correct, for my part, to generalize the NPA procedure for the last shot.
Cheers.
Fly safe & enjoy life