I guess this is over alot of peoples heads that do not remember that at one time all the forest service out houses were just a hole in the ground here in Idaho..When it was almost full they covered it and dug another hole.
There are millions of back packers/hunters/fishermen and people who just pack back in miles away from a road and have to do there duty where ever..The big hunting guide camps build latrines or do like the forest service used to.
The purpose of a cassette or porta potti is the ability to dump almost anywhere such as a forest service outhouse or even a toilet and yes,that 1" deep hole I just dug.(laughing).
Granted,cassettes and porta potti's are not for everyone but it does surprise me the lack of understanding how they are used.
Most all of the older campers did not have toilets and black tanks/gas/electric figs or plumbing,just a line from the sink to the outside to catch in a bucket ..Some of the larger had rooms for a porta potti to use indoors then dump when and where you desire.
There are a cazillion ways to break the waste down in the toilet including the new stuff for RV's they use in septic tanks..It isn't as gross as some make it out!..
It is just the same as people with RV's with blank tanks that transfer there waste into the totes on wheels and wheel it down the the dump except with the smaller cassette it is much easier..Yes,I also have a 35 gallon tote on wheels for my RV's with a black tank to transfer the waste to a proper place.
Many many RVer's use the totes on wheels as many use the cassette toilet the same way, but with more options to dump...