There's only 4 classes out of 24 that can have Dexterity as their primary stat?
It's funny... but it just so happens there are 6 stats, and if 4 classes out of 24 can have a primary stat of Dexterity, it seems to me that Dexterity is represented exactly in a normal distribution.
There are also 6 classes that can emphasize Dexterity as a secondary or tertiary stat.
Besides, reducing Dexterity to speed isn't really accurate. It's kind of like reducing Charisma to attractiveness.
Dexterity is not only agility and reflexes, but also accuracy, hand eye coordination and balance.
You also have to get into fast at what. You might imagine "rogue" when you think "fast", while I imagine "elf barbarian".
Anyway, there seems to be a reasonable amount of Dexterity to go around, not only in Primary stats but in secondaries as well. A rant is not really warranted.