Uh, I think you just don't understand what I'm saying. Either that or you're just stuck with your own opinion.
I think the "extra" speed point is completely useless. Actually, not "think", know. If you think people will follow the analysis like sheep, why are you then saying that people put more speed on their Metagross? If you look at the analysis for lead Metagross, you see that the Speed is only 8. So, how did the speed suddenly get far above 8 when people follow the analysis like sheep? That's because, and I'm considering your point about "most players run more speed" to be true (which isn't), people that are even slightly competitive may and will add more speed to outspeed other leads. That's how it slowly rises from 8 speed to 12, then 16, then 20 and so on. Looking at reality, most Metagross that are meant to outspeed other Metagross have slightly higher speed like 16 and 20, not 32, 36. And that's why the speed is at 24: to outspeed standard lead Empoleon and to outspeed most lead Metagross. Obviously this isn't "all" lead Metagross, but it is "most". If the speed would increase steadily and become higher than this set, even slightly competitive players will adjust their speed settings higher than 24, hell, maybe even to outspeed this set. The analysis is not meant to replace the competitve battler - if the player, a player like you, truly thinks most lead Metagross are faster than this, that player will see to that their Metagross will be faster. The fact is, most are slower than this and therefore most competitive players won't feel like it is worth sending more EVs onto Speed when it acomplishes nothing but outspeeding the rare 28+ speed Metagross, or should I say extremely rare.
Even if you were right and Metagross would usually have higher speed than this, just take Gliscor as a perfect example. 308 was once the benchmark for almost all Taunting Gliscor, but since the ability to outspeed other Gliscor and other Pokemon that aim for 308 speed became so important, people began slowly raising their speed, and some even just go all out 252 Speed instead of 220/224/228. But, do you see the analysis change because of that? No. The point is, the analysis is meant for a large pool of readers, and if you consider other sites that come to Smogon for the analysis pages, you see that most just care about the benchmarks, and less about "I need to outspeed other identical sets" simply because they're not that competitive. Analysis on Pokemon such as Gliscor and Metagross have always been like this, just as proof of all of my points.
And why the fuck do you think I don't know about Metagross leads? Do you honestly think I would go out of my way to contribute a strategic Anti-Lead Metagross set without knowing how Metagross works? Trust me, I know exactly how to use Metagross, and I definitely don't need to learn from any RMT. If you've done anything with that link, it's insulting me. Honestly.
And, no. The common lead Metagross was once used as a reliable SR using anti-lead, but quickly developed into a sturdy reliable SR user, and that is it's purpose - to reliably lay down Stealth Rocks. This metagross, on the other side, acts like an anti-lead purely, trying to beat the biggest number of leads simply because it can, and even if it were to have SR, that is not it's priority. It's a priority on lead Metagross, not on anti-lead Metagross. And that is, by the way, why this set is relevant and not a slight variation of the lead Metagross set, which it technicely is. Meteor Mash, Earthquake, Bullet Punch and Explosion are all needed, as your goal when using this set is to not let your opponent's leading strategy go like it should - be it by stopping fragile leads, exploding on "reliable" SR leads, ect. I hope you see my point, SR does not belong in this set simply because, if using this set correctly, you wouldn't use SR anyway. If you're using this set to get SR up, you're better off with the lead Metagross set.