With a quarter of the caches I've found, a "needs maintenance" log means a half-day or more of effort from the cache owner to follow up on it. I'm not going to ask that level of effort from someone on a "might". I'll only log an NM on one of those when I'm certain there's something wrong with it.
So ... who's asking you to do anything different than just that? Why on earth would you log a NM if you didn't think there was a problem that needed attention?
Are you in the habit of posting frivolous NM logs on roadside caches? I don't think likely, so your statement just supports what I said.
Post a NM when there's something wrong with a cache, wherever it is!
There's a difference between "might be an issue" and "is an issue". To give two examples where I didn't log an NM:
1) The cache is hidden in a location that I think will flood come spring, and the container doesn't look waterproof enough to survive submersion. However, it's apparently gone ten years with no trouble, so maybe the cache owner knows something I don't.
2) The cache is currently hanging from a tree, but the loop it's hanging from is nearly worn through. It's likely the cache will convert itself into a perfectly good ground hide over the winter, with no real change in difficulty (and without invalidating the description).