u/Humblelicious

I've seen casters mention these power spikes in various matchups even when upgrades are around even for both sides. Assuming the opponent has kept up in armor upgrades doesn't that mostly negate the attack upgrades (at least for marines). And how exactly does the armor upgrade for the terran bio contribute to a power spike? Due to how attack upgrades work, wouldn't 3/3 marines technically be squishier against a 3/3 collossus for example than 0/0 marines vs 0/0 collossus. Same for other units like lurkers, banelings, ultras etc