I mean you could always just wipe your ass, leave the TP in the bowl for like 48 hours, and then flush it, but then that kinda seems unsustainable unless everyone has their own toilet and only needs to poop every 48nhours which isn’t gonna be the case in a poor country I bet.
This is the case with many countries where toilet paper is cheap and shitty and will clog the hundred years old shared plumbing systems which probably drains into the same system as the rainwater drainage. They still have plumbing systems, though, so some form of bidet is still viable. So, wash with your left, eat with your right, as is common in india. Not too big of a problem, I’d say, so long as you have soap and water to wash your hand afterwards and you do a thorough job, and maybe also have a diet where you’re not shitting your brains out every time, and maybe also have a shaved asshole or something, but yeah.