I would argue that the idea that people differ on conveniently observable traits is flawed.

Artificially injecting a demographic into an area in which they are underrepresented doesn't guarantee you anything. You can't assume that because of a person's race, gender or background that they think in a particularly different and/or novel way. Superficial differences should not result in mandatory quotas to be filled.

Part of my problem with this line of thinking is that there is this implicit idea that being in "tech" (whatever that means) is A Good Thing. Being a programmer is NO better and NO worse than being a carpenter, or a interior decorator or the President. But yet, when was the last time someone wrote an article about how there were not enough female garbage collectors?