I also hope it will be cheaper, but it's definitely worth paying more for Waymo because of the better experience: safer, smoother, quieter, no weird smells, or conversation, etc.
If anything Waymos are much more likely to have weird smells than Ubers since the robot can't smell. Nothing is stopping someone from scrapping some dog doo off their shoe onto the carpet to the pleasure of the next rider.
Unless the weird smells come from the driver. If a customer causes a smell the car will be cleaned and the customer fined. If the driver is smelly - like from sitting in a car all day - there's nothing to be done.
Who can tell who caused the bad smell? If you have a driver they'd know but how will Waymo know which of the 20 or so riders dragged in dog doo, maybe the doggy doo accumulated through the first 10 rides. Who foots the bill then?
They are definitely cleaner right now, but that's probably mostly because only rich people and tourists currently use them. If they ever become cheaper than an Uber I would expect them to become smellier too.
but anyone who gets into a Waymo that smells like dogshit can get out, report it, and wait for the next one. Are you describing a real problem or just one you imagine?
In these scenarios you do understand that there will be a non zero number of smelly Waymos, that was my entire point, also until someone reports it you really won't have that smelly Waymo fixed.