I don't see why we can say that Latias is doing pretty good considering that it carries less EVs.Of course but considering the 68 ev difference in special attack its not that substantial most things that latios 2 hit kos latias will also and vise versa, its well worth it considering the pretty big bulk difference the two mons have with that ste (why latias is the best defogger and utility mon in ou rn
if you wanted to run max special attack on latias you can also do this and still be bulkier then latias with access to healing wish of course latios runs that set better... but those difference arent as big as the massive bulk latias has over latios and its not like latias is weak anything dropping a draco with 110 base special attack and lo is going to hit hard, but taking a life orb gengar shadow ball is amazing mfing bulk (and as you can tell the bulk difference is about 20....) latios will always be the harder hitting mon but in this metagame defog and healingwish is HUGE for offense which is what many people think is the best type of team right now. Latias can just play so many roles for you and is just a pain in the ass in general, while latios hits harder its easier to trap and there's a reason why most teams run latias over latios..
252 SpA Life Orb Gengar Shadow Ball vs. 72 HP / 0 SpD Latias: 273-322 (85.5 - 100.9%) -- 12.5% chance to OHKO
252 SpA Life Orb Gengar Shadow Ball vs. 0 HP / 4 SpD Latios: 312-369 (104.3 - 123.4%) -- guaranteed OHKO
Damage is damage, power is power. You cant make exceptions to that just because it suits you. Latias has its uses over Latios. Hell, I even use Latias more than Latios just bc of the things it can check/counter better (Keldeo, Electrics, etc) and more reliably. But I often do it reluctantly, because I have to. Latias is really that weak and exploitable compared to Latios, as my friend Jukain said way back when. It just isn't as good as its brother.
Also, the 72 HP "Bulky" Defog set has been around since early XY, very common, so I don't understand why it is some new huge thing for Latias. I also wouldn't call it a Bulky set because at the end of the say, its still, what, 18 more hitpoints? I mean, anyone who knows me knows that I like to EV a lot, and I really like to optimize my spreads and squeeze out every last hit point, because every last HP matters, but realistically, it still is just 18 HP at the end of the day. Nothing huge. I guess it is bulky compared to what Latios brings to the table, but compared to a Latias without any bulk... its not all that different or gamechanging.
MikeDawg's point of Latias being a better lure is intriguing, being less expected and all. I do think that is a very good point (though I wouldn't call EQ Latios standard but thats just semantics). However, I do feel this goes both ways. Personally, I use a lot of lures, and when I do use them, I prefer to get the kill the first time. Lure them and kill them while you can instead of coming close but just short and letting them get away afterwards. It's one of those things that sort of comes down to preference and all, I feel, but I do like to get the job done the first time, yea. Latias can do it, but not quite as well as Latios.
Also on the Healing Wish point, if I'm running Latias over Latios just for that move (which i have done, as I imagine many of us have before), its once again begrudgingly. Until I Hwish something up, I just feel like I'm using an inferior Latios the whole time. Its almost.... disgusting to be forced to downgrade myself for that. Healing Wish is a fantastic move yes (Not enough people use Hwish Clef), but every other turn i have my Latias out i just want to kick myself for it.