Solid Macro 4 gateway + forcefield = ownage ?

That bloody owns any race, at least i lost to it still
wait, i am bronze and you are silver

this is my takes on 4 gate built
a) It counters every early aggression an enemy can think off.
b) Banshee? no problem, just attack on 5 minutes mark before clock finish and all his army is probably few non-upgraded marine.
c) MMM? forcefield ftw then tech to 2 collossus with range and GG
d) use one observer and you can see his army composition and warp in units accordingly and if he expand or trying to built fancy units, that is so the time to attack

I am bronze but i have hard time winning the above toss without good tanks position. brrurr i hate that observer

i am bronze only but i did encounter this :

good 4 gate normally you put down the other 3 gateway after u kill the first scout and when your mineral is 450, all at the same time, this is from 4 gate guide built. How will you know he is doing 4 gate?

On 5 minutes mark if toss were to charge terran ramp and there is no marauders and saw bunker, toss can just tech up an observer and use chronoboost? If i am not mistaken the timing should be on the spot before terran gets cloak.

or maybe my 1/1/1 is badly screwed

follow up by polt timing attack built? cause u already have starport with tech lab. Does this works well? I been thinking how to stop this 4gate