I still don't understand why people are trying to "fix" already good metagames with no inherent problems.
I agree with this completely. I personally think the DPP metagame is better than it was years ago. It allows for more creativity since the level in power is lower. There is much more ways to approach teambuilding.
Many players have been innovating new sets or using pokemon which never saw play years ago in the Latias/Mence metagame. Why? because the power level is lower and there is more room to be cute. Less of "This pokemon is really good, and I should strive to use it. It might not be the best single pokemon, but I will use it along the best pokemon since its just that good."
SpDef Gliscor, Crobat, Cradily, Quagsire, OTR Bronzong, Venusaur, Bold Reflect Starmie, Dugtrio, and Abomasnow are just
some examples. What would Latias bring to the table for a better metagame? It isn't like Infernape is too hard to deal with and we need another check to it.
I know Spec'd Latias can be walled by Vaporeon + Skarmory, although that only applies to defensive teams. What about the bulky offensive teams? What about the standard offensive teams? Your best switch in is Scizor? Im pretty sure im going to win that game with Latias, if your best answer is honestly a Scizor.
Tyranitar is the best answer, and we shouldn't encourage more people to use it over steels. Steels are the best switch ins to dragons, and Dragonite, Kingdra, and Flygon get punished more by steels. Latias just switches out, then comes back in when the steel is gone. Scizor either gets nuked or HP Fired.
It is bad for teams that don't want to run Tyranitar, since SpDef Jirachi only forces Latias out and doesn't always fit on more frail teams. Especially since Latias can put a ton of pressure on most things except that SpDef Jirachi, and the Latias player is gonna pack SpDef Jirachi counters.
Latias kill things not named SpDef Jirachi. SpDef Jirachi? Send in your counters. Its a stalemate where Latias is one of the best pokemon for the job. Since its a dragon, and power creep its higher than what the metagame is used to.
It would make the metagame inherently more bulky, which is bad for metagame diversity. Can't use a SpDef Heatran on the more aggressively minded teams.