We are not nearly as frequent travelers as some of you here, but we travel several times a year. We have literally never had a room check done when we were in the room, even when there was no daily housekeeping (which is most hotels now) and we kept the "do not disturb" sign up (which we do often because we are night owls and sleep late). Certainly doing one every day seems way outside the norm.
Now, maybe they were doing them when we were out of the room. But, if so, they were respecting the "do not disturb" sign and were timing it so as not to bother us. Which is fine. If we're out and about, come in and check the room all you like. However, unless there is a really unusual situation -- like someone never leaving their room for several days with no explanation -- then I would find it very intrusive for a room check to be done while we are there. And especially if we were in the middle of doing something private like sleeping or bathing or... er... y'know.
I realize these companies have armies of lawyers telling them that they have to do this stuff to protect themselves from liability. However, it really is mostly "security theater" and -- again, barring extremely unusual circumstances -- there's no reason it can't be done at times that do not disturb the guests. Just because my family happens to be a bunch of night owls doesn't mean that we should be subject to a stranger walking into our room at 8 a.m. each day.