Aeg is obviously really versatile, but I do think it's worth pointing out that rarely does such versatility really cost you, and while nothing counters all of its sets, there are plenty of good initial switch-ins to Aegislash that can scout for its impact with more of a margin of error than against other "what set is it running?" Pokemon like Deoxys-S, Mega Lucario, or even something like DPP Salamence. It's an amazing pivot, breaker, tank, etc., but while I think its versatility adds to its effectiveness, playing cautiously--and having a really solid initial switch-in, like Mandibuzz, Heatran, or Mega Venusaur--can prevent it from taking out a Pokemon from sheer surprise factor. Conversely, its versatility is much more troublesome for me just in the sheer amount of good sets it can run. The breaker, tank, Toxic staller, and SD sets all have different counters and can devastate a team even if you know what it is. So for me, Aeg's versatility is less problematic in-battle, but it becomes an issue during team-building. It's one of the few Pokemon that you can really never be over-prepared for.
Ghost is an OP offensive type and Aeg has the perfect tools to use it. Simple enough. Its defensive typing is more of a mixed bag, and while it allows Aeg to pivot better than probably every pivot ever, it is forced out by a pretty large number of OU threats: Bisharp, both Charizard formes, some Mega Venusaur, Tyranitar, Heatran, Keldeo, Greninja, LO Terrakion, Rotom-W, Landorus, Landorus-T, etc. These are dangerous Pokemon, and King's Shield can only do so much. As an avid/obsessive Aeg user, I find its low Speed and vulnerability in blade form (and even shield form if many of the above threats come in) to be a significant downside to using it. Of course, it also checks or straight-up counters a ton of annoying Pokemon and can Pursuit trap some of them. I guess my point is that Aeg's typing and ability allow it to be the dominant force of OU, but just as soon as it takes momentum for you, you'll have to deal with some other behemoths. Who likes switching into Landorus? Charizard? If only 60 base Speed weren't so exploitable (and maxing it out to net surprise kills, outpace Azumarill and Mawile, etc. really compromises its bulk).
So not to run this into the ground, but it really is DPP Latias to me--easily the best glue Pokemon in the metagame, fantastic pivoting capabilities, unique and useful defensive typing, great stats and offensive typing as well, and bulky, difficult to wear down, and fairly versatile. And both are/were "metagame glue" Pokemon that undoubtedly define the metagame and almost singlehandedly limit certain Pokemon while increasing the utility of others. Both can be Pursuit trapped and can cede momentum (as Latias often did to prime U-turn spammer Scizor). And I think the comparison is useful because I think Latias is a fascinating ban case itself, where you could make a compelling argument for or against a ban. If Aegislash gets banned, the metagame will almost certainly profoundly shift in a way it didn't when, say, M-Kanga was banned (hey let's just use a new OP attacker!!!), as Aeg is pretty irreplaceable. Just like Latias. I guess it depends how much you think centralization is important in determining if a Pokemon is broken.
The writing has been on the wall for this test for a very long time. I think it will probably get banned. Personally, I'm pretty torn about it. If you pressed me, I would probably say that we should
BAN Aegislash simply because it's so good at what it does and is so difficult to stop without it doing its job. It's one of the few Pokemon in OU that really can transcend bad match-ups and still somehow get two kills and hold off key opposing Pokemon for much of the match. And then there are King's Shield 50/50s, which can be super egregious but are much easier to teambuild around than, say, priortity Taunts and Thunder Waves from Thundurus which are just the worst. @
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Fascinating Pokemon, can't wait for the conclusion of the test.
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Why are the beautiful sick and divided like myself?