That seem a strange correspondence. Just because it's common doesn't make it right.

In the scheme of things, it is minor enough that I have never asked for any consideration (other than having it fixed), so we agree on the conclusion but take a different path to get there.

If I had some way to tell that previous occupants had notified the hotel that the drain is clogged, I might well ask for compensation, because that would indicate the hotel is willing to provide a deficient service.