I think that's the hard part for travel in general right now. Because a lot of these adjustments are not necessarily a full on policy change OR they aren't wanting to make it a full on policy change for ever and ever you get random rules at random times.
You'd like to hope they would publish something for those in general but if it's not something they want to keep forever they may not want to put in the effort to do so. And I could also see it being so and so saw the towel and figured why not I'll do it too even if published info says otherwise.
I agree - travel rules are confusing right now. Pre-covid, I was never told to put old towels in the hall, but post-covid, I have been told to do so, multiple times at different hotels. Never a 5 star hotel, but 3 star and 4 star ones.
I do agree that some people have a general disregard of others, but I do also think with current circumstances and constantly changing protocols, someone could think putting towels in the hallway to pick-up is appropriate especially if other locations do this, DVC has told others to do this in the past, etc.
That being said, I don’t think leaving wet towels in the hall would ever make sense even in current times. At a minimum, hang them up and let them dry prior to this.
Finally, in an ideal world, people are 100% considerate, and we don’t have to remedy poor behavior. However, realistically this will never happen, and I think Disney does have ultimate responsibility for maintaining their facilities. If towels are left in the hall, they should remove them timely and warn the guest as appropriate. Also, if this a reoccurring issue, maybe make a change to combat the root of the problem. I think in many cases, people just don’t want old towels out of their room. If Disney had a towel drop to discard used towels, then I think many (not all) people who want to discard towels would utilize it. However, I don’t really know how wide spread this issue is as I don’t recall seeing this commonly.