For two decades I lived in a fancy flat with all the amenities in a large city.
Now I do it in two 100L plastic barrels in my stables that also have an outhouse, each barrel corresponds to one of my needs.
I neutralize number 1 with Corega tabs in the warmer months, I neutralize number 2 with a scoop of peat or sawdust.
I also wash myself (in number 1) after number 2 using soap and a 10L-bidon with a shower hose attachment that I carry with me like a briefcase from the house during the colder months.
The barrels are emptied regularly in a hole in the woods, in summer the dung beetles take care of everything. There's virtually no smell, actually less than in a modern bathroom with mechanical ventilation. It's always drafty in the outhouse and I usually leave the door open anyway.
I can wax poetic about sitting in the outhouse on a sunny day with the door open watching the blue sky and hearing the wind in the trees with the birds chirping vis-à-vis doing it a concrete box surrounded by high-tech plumbing and equipment, but ironically it just feels better not having any nastiness inside or anywhere near the house I sleep and eat in.
Just think about that for a second.
I've been to Japan and I actually prefer my way.
I think technical (smart?) toilets are nasty, nasty to clean and even nastier to repair if they break.
Less is more, if given the choice I'd much prefer a simple (dumb?) toilet with a shower hose next to it.
This is pretty common in most bathrooms in Sweden.
P.S.
Rimfree toilets are the shit.