What exactly does the 24-hour heroic instance lockout do?

[MiRai]

I got my team to 80, and i've started working on Glory of the Hero. Whenever i first go into an instance, it says there's a lockout (today it was 18 hours when i was doing it).

If i clear the instance, i can't requeue for the instance through the tool, but if i wait a while i can go to the instance directly and the mobs respawned.

Is the purpose of the lockout to prevent the use of the tool? Are the bosses not respawned? What exactly does the lockout do?

I'm confused.

It's there so you can't continuously farm that particular dungeon. As far as I know, you can make it back to
that dungeon again if you get lucky (or unlucky) through the Dungeon Finder.

[Heavyd]

if you don't kill the final boss, you can continuously reset, right? I'll be testing that shortly.

[Shodokan]

if you don't kill the final boss, you can continuously reset, right? I'll be testing that shortly.

no you can't

[Heavyd]

Yep. figured that out. All the mobs are there except bosses. they're gone.

Well shit.