Stealth and monster visibility detection range/agro, looking for help

Does anyone know how this works and if so would you be able to educate me?

I've read the stealth wiki which has a good explanation of stealth but doesn't go into the specifics of monster visibility detection range or how agro works.

I'm using aspect of the cat and trying out the claw mastery node, mostly interested if stealth can help as another layer for defense, or any other applications it might have.

Most of the small amount of information I've found seems to be players using it in parties to avoid taking agro, but does it have any application for solo play?

What is the leash range that monsters stop following the player and does stealth interact with this value as well?

Say if I'm in delve could this possible help for splitting or loosing a mob by getting out of a monsters visibility range faster?

How about with projectiles, does it lower the range at which they will be fired at you from when you move away? Or does it simply relate to the first moment when the monster detect the player?

I'll do some tests on the leash range on the beach but, not sure I'm going to be able to understand how it works in combat against large mobs or bosses without someone who knows the mechanic specifics or radius values helping me.

Testing: Visibility detection seems to be fairly close to side a top of monitor, activating stealth through cat stealth can cause a flowing monster to become unleashed and stop following if they are in radius where stealth changes the status of visibility.