Been thinking about it.
Detect hidden is almost useless in the field... outside Fel, I'm thinking. I think you would need both skills for this type hunter. Tracking... to find a stealthier moving to attack you... Detect Hidden to expose them, so you can attack/kill them. Not that I really know PVP. Its just, running stealthers for 16 out of the 18 years of playing... if a monster causes you to become visible, you can quickly re-hide before they can attack you.
I remember, a few years ago, it was a big stink about thieves hanging around houses, harassing owners, looking for those people doing decorating... hoping they can steal something valuable before the owner could lock that item down. I'm thinking thats why anyone can use "Detect Hidden", even at 0.0 skill. However, this was long before "Wind Chimes".
When we got Wind Chimes (I'm thinking ML), you could keep one at entry points to your house to allow you to hear something... or someone... coming in, mounted or stealthed.
Even right now, I have a vendor owner that always recalls in unmounted and instantly hides... and I hear Wind Chimes as he stealths. Drives me a bit buggy, but whatever. I always do a simple Detect Hidden when decorating. These "noise-maker" monster statues? Its just not as attention getting to use as warning someone is near by. The world is just too full of these type noises... so I'm thinking thats why they aren't as attention-getting as the chimes are. Until they make a statue of an explosion! hehe