everyone you ask will have a different opinion what the scout does, CCP has done a really good job of making sure it does all those roles but doesn't do them all at the same time. in fact they have done too good a job in that regard, the scout is amazing it can have 100+ meters of passive scan, or 700 hitpoints, or be completely unscanable. doing any of these things though means that it is hopelessly incompetent in all other areas.

rolls of the scout:
assassin (Rogues do it from behind)
recon (I saw you coming from a mile away)
ninja (you didn't see me coming)
disruption specialist (in your base hacking your cannons)
sniper ("it's a legitimate tactic!")

if a scout has decent ehp, it isn't playing to it's strengths and relying too heavily on it's passives
if a scout is fast; it isn't stealthy, has no scan range, and its made of tissue paper and nitroglycerin
if a scout has a good scan range; it isn't stealthy, fast, and its made of tissue paper and nitroglycerin
if a scout is stealthy; it isn't fast, has poor scan range, and its made of tissue paper and nitroglycerin
if a scout is sorta fast and sorta stealthy, it's relying on it's passives(which aren't very good) and isn't very good at anything.
if a scout is a sniper, a logi is doing it better.

at low tiers the scout is slot starved
at all tiers the scout is ehp starved (scouts shouldn't have a lot of HP but they need more than they have)
at all tiers is is cpu/pg starved
it needs more stamina and speed
and a longer scan range

if I could fit a range extender, a cardiac reg, and the necessary tank on an ADV scout i would be so happy.

a combination of slot starvation and well thought out but less than Ideal base stats forces the scout to specialize into one role at the complete neglect of all the necessary elements of a well balanced fit with good synergy.

The scan dampening suit bonus is going away for all but the gallente scout. So... No more hiding with one dampener.

I can get under adv scanners with a basic dampener with only level 3 dampening on a minmitar light. So taking away scout bonuses won't impact that. Unless the profile is being jacked up to50 for lights but even then a complex gets you to 33.75

Proto scanners are pretty meh abd don't have very long durations. So if someone wants the pg/CPU/ isk to counter you that's fine. Most players won't abd those that do need to sacrifice to do so. One slot will counter almost all scanners