@Raquel24
I also agree with you in principle but I can see it descending into bedlam.
I anticipated one group my guests were going to try to sneak in extras, rang airbnb, and was told I needed photographic evidence that they had actually slept over ( right so I was going to break in and photo them sleeping??) and /or a police report. these boards are full of CS taking the guests side over the hosts, so I think it's unlikely. Trying to be absolutely detached, I can also see some dishonest hosts, make some sort of accusation like this in order to head off a bad review. But I do think if a guest OR a host have had to make a claim/ raise a dispute that the option to review should be removed.
It sounds like you are concerned you are going to get a not so great review because of guest dishonesty. that's never nice, but as you have so many great reviews, it's not really going to affect your ranking. So long as you leave a factual detached professional reply to anything negative they may say, prospective guests reading it will quickly see what's going on. IN fact it may even work in your favour - potential dishonest guests reading your reviews will see you've held guests to account and decide to head elsewhere! There's no doubt the review system is deeply flawed, but great hosts such as yourself will win through in the long run. And the good thing is you can still review them and alert future hosts to their dodgy tricks. Put them to the back of your mind, leave THEM an appropriate review and move onto your next great guest.
p.s I have found having a video camera at the front door ( disclosed in my listing) combined with a substantial security deposit and the removal of "guests can check themselves in with a keypad" has eradicated the problem for me. ( so far) I still HAVE a keypad and some guests still have to use this, but I now say on the listing I will greet in person if possible, - otherwise there's a keypad for easy check in. I think the guests who plan to be dishonest specifically look for places with self check in. It's much easier to head off the dishonest ones and get them looking elsewhere, than to deal with them actually flouting rules.