Marines versus zealots

So here's the rundown:

20 marines will quite easily defeat 20 zealots. The zealots will find it very difficult to surround any given marine, while the marines can pick them off one by one.

On top of that, let's consider:

Marines can attack air.

Marines can use bunkers.

Marines have a ranged attack, which enables them to take advantage of barricades, shoot fleeing units, and intercept scouts, much more easily than zealots with melee attack.

So it seems that unit for unit, the marine is simply better than the zealot. This is despite that marines cost HALF both in crystals and supplies.

Let's be realistic about this. It is a fundamental flaw in the game. The only reason it isn't fixed yet is that serious balance discussion is almost impossible as long as childish "l2p" bull**** rules the roost.