Oh, I value your post, sorry you didn't think mine was insightful. Your your post came across like a big iron tractor use only for tilling with a disc harrow and made it seem the OPs posting for his machine was inferior and to forget even thinking about doing it.
In my postings, images and success with the disc harrow with use of a compact tractor, going full depth of what the disc harrow can doing can be counter-productive especially when tilling in surface compost. Going too deep will submerge the compost to the point the the planted field of crop would never root down far enough to benefit from it.
Should a heavy disc harrow need to be lifted to keep the compost tilled in at a controlled depth range, it would fail and the 3PT hydraulics isn't reliable enough as the tractor moves forwards. Going over any high or low spots will negate that benefit. Now, Bear67 did post his pixs of the top-link hydraulic assist. This is a great way to overcome the problem, however, not all folks can afford a fancy upgrade for a couple of acres or less.