Thats not something that sounds reasonable.
Broodwar and SC2 are compleatly different games, but it seems since they carry the same name we keep comparing them.
Its no wonder that there is so much polarization in terms of whats better/funnier/harder etc.
People are comparing apples to oranges and are still trying to discuss why their apple is better than the other apple (only its an orange) and vise versa.
High ground advantage is slightly pointless in sc2:
-If you are attacking from the bottom, you KNOW you need vision. If you dont have it, you will pull away.
-If you have vision, 99% of the time the person on the low ground actually has the advantyge (since most highgrounds are bases, and therefor the concave will favor naturally the person on the lower ground).
So... the thigh ground might as well be a wall that we can shoot over, since we need vision there too, as long as one player who would be on high ground does not need vision.
Broodwar had a different mechanic:
The advantyge was always there for ranged units, but it was random to a certain degree. This meant that to cement an atack over high ground, you needed to take it. It was not a matter of "will my shoots connect or not" but "How do I get up the ramp, with enought units to still beat what my opponent has".
Thats a much more interesting question than "will he land the forecefilds right or not" or "Should I blink into his main or not".
The idea of what you want to do in this case in broodwar is clear, what is unclear is how to do it.
In SC2 the question has two answers "Yes or No". In broodwar youd get more variations. (Of course I am simplyfiing a lot since you can blink in differently and from different areas, but the main question is still binary).