Chaosmancer
Legend
What's good for the goose is good for the gander. If you're trying to claim that those non-dex feats increase speed, then the dex guy can have those non-dex feats as well. All else being equal(both having same feats) the guy with the highest dex is faster than the SLOWER guy.
Non-Dex feat increases speed. That's the end of the point. But, okay, let's make this REALLY fair. 20 dex for both, 20 int for both, Alert feat for both. The guy without Tactical Insight is rolling a +10 and the guy with it is rolling a +15. Intelligence makes you faster, and what's good for the goose, so I should be able to have 20 dex for both.
Two more arguments that I never made. That said, I will note that for the first argument popularity is in fact a good enough reason in a game where popularity = $$$. WotC is in the business to make $$$.
And giving more elves that gave more ASIs = $$$$ because being able to put elves in different roles was more profitable.
Show me one race other than elves that got bonuses in all 6 stats with 6 subraces in a single edition.
I'm in the middle of a live write after a hard day, but I'll try and remember to do some research later. Off the top of my head though, I'd say PLanetouched are a strong contender. They have multiple sub-races (Genasi, Tielfing, Aasmiar, ect) and they have a variety of ASIs.