Scanner sweep hidden for enemies

Why is the scanner sweep visible for the enemy?
It’s not realistic, because in a war context you want to surprise and hide. I think it would be more fair if the scanner sweeps were totally imperceptible between enemies always; the enemy will know Terrans have it but never noticed when it’s acting.

And remove the tremor for burrow move and the blur for anything cloaked.

And the notice for nukes and liberators!

Seriously!
what is about liberators?