I did some maths, assuming all characters have profile dampening 5, and precision enhancement 5, assault suits can be invisible from all but scout passive scans just by equiping a single basic level profile dampening module.

A complex dampener will make your assault invisible to scouts/light suits who only are getting the precision enhancement 5 bonus.

It will also work against, amarr scout skill level 1
Gallente scout level 3 (possibly, it depends on how things are rounded)

And of course against all caldari and minmintar scouts who dont have any precision enhancers added. If they even have a basic precision enhancer equiped you will be visible.

So you ask whats the point? Well the point is that people mainly seem to only talk about ewar on scouts, because doing it on other suits will give up some tank or other ability you might find to be more useful than ewar, but I find the idea of surprising everyone but the ewar scouts to be quite a refreshing idea.

I've been running my assault g-1 with a basic profile dampener to see how things go with it, I was using a basic armor rep in its spot, I still have a complex armor rep and enhanced armor plate on the suit for tank though, and so far I have snuck up on many unsuspecting assault/logi/medium suits and delivered hot plasma and grenade death upon them.

I think it might be worth it to use the complex dampener on my gk.0 fittings based on my initial feeling of success with my g-1 testing.


Edit
If you go for two profile dampeners, you will be invisible to even a level 5 gallente scout, and a level 4 amarr scout.

Any scout would need 25% or better precision enhancement ontop of the level 5 precision enhancement skill bonus in order to see you. Two module slots given up for ewar might be too much, but it is an interesting idea to think about.