Brake pedal height question

I've seen a lot of rear disc conversions and done several. I've YET to see one that I thought I liked the pedal feel on. Always came out what I call spongy. Maybe that's just one of the differences between drum to disc, I don't know, but I never have liked the feel. Thing is, most people will never, ever, EVER use the 4 wheel disc system to its capacity on the street, so a lot of times, it's.....maybe not money wasted, but IMO money that couldda been "better spent". It has just always seemed to me that 4 wheel discs was just one more thing to add to the list of things to bench race with.