Tank Projectile Intercept System activation delay feels awkward

You press the counter measures to expect to stop incoming damage, but the short delay before activating has me still taking all damage I am trying to avoid. And the delay seems too long sometimes making me doubt I even pressed it sometimes.

If any rocket already in the air will hit anyway there is almost no point, because engi will hold their next missiles till it ends, you potentially end up getting hit with every rocket they have anyway so that kinda defeats the point?

Do we really need this delay?