I think that the point is, you should not be losing it because you should be using it.

Proficient pilots practice their skills often. If you are not flying approaches often, you will lose it. If you do not study often, you will lose it.

You must practice and study.

The point of the 1500 hour rule is so we have proficient AND experienced pilots. It is your job to stay proficient.

I would argue that a bigger problem right now is the kids coming out of flight school and having never flown actual IMC. There are 1500 hour flight instructors that have never been in a cloud. You are hurting yourself if you get to 1500 hours without a good amount of experience. If all you have done is tow banners or instructed private pilots in a 172, then you are missing the point of the rule.

A professional pilot does not lose his or her skills.