My point being that can't-sign-don't-claim-a-find is a very restrictive rule and unfair to shorter people especially when the cache was not intended to exclude shorter people, just an oversight by a tall CO. On principle it sounds like a noble rule but I think it has it's problems that extends to junk caches.
I don't think it's an oversight. I think it's fair. Not everyone to find and get every single cache. Furthermore, I'll place a cache so high it can only get one find a year. You go through your childhood having every single person call you lurch or jolly green giant, and tell me you don't want to make a cache named "How's the weather up there?" with a hint of "I don't know, you tell me"
That being said, I like geocaching because its a good excuse to get outside and get a bit more fit. The regular cache of "between pine trees" or "in a stump" got old fast, I want a challenge. I want to start rock climbing, kayaking and everything in between while geocaching and placing caches. Just find someone who's fit enough to go with you. Geocaching is better in pairs anyway.