Like usual, CCP made a bunch of patches and updates, giving something a buff beyond anything to balance it in the game, because of their usual lack of forethought, testing, common sense.

Scout Frames start at 35dB. That right there is a balance problem.
Cal and Gal scouts (why Cal has it, is another nonsenical balance band-aid flub) then have an additional 15% lower profile.
Then 10% passive from skilltree.
Then optional 25% dampeners modules.
And cloak equipment (another unbalanced feature) that give optional 5% or 10% dampening

Amarr then gets precision(again, nonsensical) so 25% racial, 10% skilltree, 20% modules.
Minmatar gets stuck with zero eWar (again, nonsensical balance)


So, simple as that is. Just look at the numbers. Compare it with medium and heavy frames, and other scouts.

How did something so unbalanced make it this far into the game? Why would something be put into the game that has no counters?

Nothing in the game can counter a Gal scout. N.O.T.H.I.N.G. And what do they sacrafice to achieve complete stealth?
Nevermind that in FPS, STEALTH IS THE MOST POWERFUL ELEMENT. So, to have characters that can achieve this without counter is called U.N.B.A.L.A.N.C.E.D.

A good start would be to make Precision modules do 15%/20/25%(std/adv/pro). Have decible weaken with range and strengthen with cqc. Meaning every suit should be able to passively scan anything <3meters in the foward 90 degree view.