Question to Starcraft II game designers: why attack range is not displayed for ALL units?

I just have a question about game design.

Why Starcraft II game designers decided not to provide EACH unit with range indicators? I am talking about both normal attack and abilities.

Only few units have them, and I was wondering which is the utility behind the choice of not including all the other units.

Wouldn’t be great for players to have a range indicator when using the attack command? That would help them in positioning units and calculating distances before important engages.

I am really curious to know the developers’ opinion about this.

Would it be possible to contact them?

Thank you very much and have a happy New Year!!

Marco (CalmWater)