I love sarcastic hypocrisy. One min you advocate AH, next min you criticise it.
Nobody's advocating or criticising anything, just setting out facts. All of which were available to the purchaser at the time of purchase.
You referred to "their half of their property" (your emphasis). In a true half-and-half situation (joint tenancy) the person owning that half would have such rights.Finally, no landlord has any right to enter or bring "their" guests into their clients property so I dont know what you mean here.