you pretty much said everything i did as far as being the draw to them due to the lack of tech and using hand-built sets with perspective filming(making small models appear like giant buildings etc)
there could be a mixture of the two on the classics without turning marty mcfly from back to future into some martin mchomey from the ghetto is what i was getting at
95% of the movies back then would have been cancelled if released today like porky's for example