You still need to wipe after using a bidet. Whether you’re wiping water off your butt or poop, I highly doubt in either case anyone is using that towel on their face afterwards, so it’s moot. You’re either keeping poo towels or you’re wiping with paper that gets flushed with the poo. If you think the former is more developed then so be it, but my diet doesn’t necessitate power washing my asshole after pooping and keeping poo towels is a non-starter for me.