You conveniently ignored the part where I could have died in Blade Forme anyway had I not speed crept that 'standard' spread everyone was running at the time, just like the one you claimed everyone should be running now. The 1v1 took place after both Aegislash were in, but all you saw was an excuse to seek a fallacy without addressing the meat of the post.
Also, cripes, dude, you cannot be serious about that 1v1 example. Why on Earth would I revenge your Aegislash with another Aegislash instead of a check? If the game completely hinges on that, it's effectively a lost game. But for the record: 252+ SpA Life Orb Aegislash-Blade Shadow Ball vs. 252 HP / 0 SpD Aegislash-Shield: 291-346 (89.8 - 106.7%) -- 81.3% chance to OHKO after Stealth Rock
Offensive Aegislash wins games. Stop trying to defend what you think everyone 'should' be running, and start thinking about what actually garners the win. Aegislash already checks 90% of the faster meta with no EVs. Pheromosa, Genesect, Latios, Tapu Bulu, and fuck it, even Tapu Koko. If Aegislash gets in for free on a double, revenge, VoltTurn, or even a weak resisted move, that's a free Shadow Ball or setup move. On the other hand, if they sac their mon for damage, not only does the thing in front of them die, but Aegislash is still very well alive, even at 20-something%, to pull off more Shadow Ball/Shadow Sneak 50/50s, if not outright KO what's in front of it.
This is the defensive set I'm talking about:
252+ SpA Life Orb Aegislash-Blade Shadow Ball vs. 252 HP / 252+ SpD Aegislash-Shield: 226-268 (69.7 - 82.7%) -- guaranteed 2HKO after Stealth Rock
Can always take a faster Aegislash's Shadow Ball and OHKO back. If I've been able to tell that your Aegislash is speed creeped, there are situations (perhaps one of the many, many, checks to Aegi has been taken out) where you'd be willing to take the hit and get the opposing Aegi off the field. And then, as you say, stick around even at 20% or something.
Also, I don't know if Ezio's Aegislash had LO or not, but if not Shadow Sneak would probably not have killed you even if you didn't speed creep. Coin flip, and you didn't know if
his Aegislash was speed creeped so you were apparently cool on flipping a coin either way. Why focus on heads and not on tails?
El Oh El at calling my refusal to accept 20% vs. 100% starting life totals as a proper 1v1 a "fallacy". "Even though he was at 20% life and I was at 100%, he maybe coulda woulda shoulda killed me there instead!" ...yeah, nah. If you think it's a fallacy, switch the health totals.
You can still check Tapu Koko and Genesect reliably if you're both at full, but you pay some opportunity cost for running offensive as they can both blow you away much more easily than SpDef versions if you have even a little prior damage. The numbers actually get a little nastier if Genesect snags a SpA boost.
+1 252+ SpA Life Orb Tapu Koko Thunderbolt vs. 0 HP / 0 SpD Aegislash-Shield: 177-211 (67.8 - 80.8%) -- guaranteed 2HKO
+1 252+ SpA Life Orb Tapu Koko Thunderbolt vs. 252 HP / 252+ SpD Aegislash-Shield: 136-161 (41.9 - 49.6%) -- guaranteed 3HKO
8 SpA Life Orb Genesect Flamethrower vs. 0 HP / 0 SpD Aegislash-Shield: 140-166 (53.6 - 63.6%) -- guaranteed 2HKO
8 SpA Life Orb Genesect Flamethrower vs. 252 HP / 252+ SpD Aegislash-Shield: 107-127 (33 - 39.1%) -- 99.8% chance to 3HKO
You're right about Pheromosa, Latios, and Tapu Bulu, though Tapu Bulu can at least Leech Seed Aegi on the switch.
I will concede that offensive Aegislash opens up holes in HO especially if given free switch-ins. It depends on play style, too. Of course Offensive Aegislash wins games. Endeavor Rattata wins games. Defensive Aegislash wins games too. I prefer the latter. Is that what this discussion is about?