They have an addon now, Under Achiever.
Where any link you make, shows your toon as having that achievement.

Now they need an addon, where GearScore believes you have a 5500 GS or whatever.
Irregardless of the gear you have.

It should not be (and on my server is) a requirement to have a GS far above what you need for the content.
It should be (but is not) that you just need to know the fight and be geared enough for the content.
Pre-Ulduar, when most of the server was fresh to 80, in a mix of quest blue/greens, Naxx 10 was easily doable.
Toons in that level of gear today, have 2500-2800 gear score.
Some idiot on my server wanted to do Naxx 10 as a pug, but was requiring 4500 GS, which is better then full Ulduar 25 gear.

Blizz would be better off with hiding the Gear Score completely.
Or if the player base wants it, having an internal rating like they have for instances in the LFG tool.
With a substantial boost to alts rating, if any toon has done the encounter successfully.
So it measures both your gear and your knowledge of the encounter.
But does not say, geared for any specific raid, but rather yes, this toon can do the raid you're attempting.