But some LLs claim that property managers don't do anything. That I don't understand TBH. I totally understand that most employ a PM because they don't want to deal with any of the stress. I can't say I blame them.
I think a tenancy should be treated like hiring a hotel room. If I was advised that I could rent a room in a hotel and they'd be doing some maintenance outside, and came inside to find the owner using the toilet and then running outside pretending he hadn't been in, I'd be just as confused as I am about the OP. There should always be a certain level of professionalism when it comes to rental properties whether they be holiday homes, motels, commercial properties. The landlords would have had no idea whether the new tenant had started using the property, unless they went and looked through all of the windows, which is just as invasive.
I prefer rentals with property managers because I feel they do act as that professional third-party because it's not their property on which they pay a mortgage or rent.