It may be a matter of perception. You not seeing things doesn’t means those things didn’t happen. You’re not taking in account your own risk of mistake.
Mistake. David Kim left SC2’s balance team two years after LotV’s release.
He concurred to LotV’s splash and cloak widow mine nerfs.
Another mistake. You’d need Yamato + TJ to do that.
Fact is without TJ an equal supply of corruptors (3 corruptors = same cost than BCs at ± 50M) will beat BCs with a large margin, even with a complete round of yamatos.
Even with Tj available, since your ID includes Z, I suppose I don’t have to remind you that regarding harass uses, the cost efficiency of BCs yamatoing each other and them tactical jumping into a forest of spores/hydras/corruptors is absolutely horrible. That makes neural parasite one of the very best counters to BC harass in the whole game.
Cost for for cost you’ll have 33% more stalkers supply wise. You’re not going to trade well (specially with blink), and in a straight fight at home you’ll lose the BCs. Which is why BCs almost aren’t used as openers in that MU.
At equal supply however, the BCs would win the fight ; which is what the redesign of the BCs did change.
I do wonder then why the unit is so infrequent in high level TvT and TvP. I mean the unit you described seems wonderful. Maybe terrans progamers are also affected by those delusional and blind staring away issues ?
Same for the devs. Why, why in the world would they have committed such pure buffs to a single race, if they weren’t delusional an staring away from facts as well ? They even went as far as buffing the BC’s autoattack even after implementing the yamato+TJ mechanics.
You might be surrounded by beings all delusional and blind to truths only you can see, ErazorZ…
Alternatively… your perception might be somewhat mistaken. 