The draw back with the Studor Single Pipe System is very apparent to me. PAPAs aside (they can be used on a dual line drainage systems) there is no separation of Grey water from Black.
When the Black (waste) line gets clogged up you will be walking in that waste in your shower. The use of a single line drain is very un-sanitary period!
It's amazing that the Mexicans use a single line without venting even though the public drainage system hasn't been installed. All of their Hospitals are built this way! Very un-sanitary.
The story of "SHIT" is that the second "SHIT" will eat the first "SHIT". The volume of "SHIT" will never gain until you add water to it period!
Minimalizing the water in the waste/cess-pit involves venting it for evaporation purposes & reducing the volume of water that allows the "SHIT" to gain in volume.
The amount of water needed in the "Crapper" (the tank behind the toilet) becomes the issue to produce the "scouring" affect that you prescribed for cleaning the line. Evaporating the access water at the waste/cess/systern/pit should be the key issue. Not dumping it into a public drainage system that inevitably deposits it into the ocean or water table. Waste itself can be great fertilizer.
In Skyscraper construction there should be 4 lines. 1 for grey water drainage & venting, 2 for waste drainage & venting, 3 for venting the waste systern (very large cess-pit) & 4 for venting the grey water systern before it overflows into the public water system or onsite RO unit (reverse osmosis plant). They should all go to above roof level, though some have the systerns in a wing far less high than the original skyscraper those reductions in height of the venting adds up to back pressure problems. They need to be equal in height & diameter.
Cross venting from the Grey water line to the Black water line has been the norm & has been sustained with a street-t & costly reducers for many years. Clean outs on every floor to facilitate plumber access with snakes at waste height in the wall with street-t's also prove that water & waste do not reach terminal velocity even when the water falls from a hundred feet up, the diameter being the key.
I see the two lines being separate completley & marked so. Pinching pennies on the plumbing system is guaranteed to prevent property appreciation & very un-sanitary environmental conditions. Maybe also enhancing the likelihood of Humankind's predictable demise, drowning in their own "SHIT".