Earlier quoted context omitted.
> Why wouldn't one just call and avoid all this nonsense? Because if you're trying to take out a 20-something that you've only had passing interaction with, texting is the socially acceptable way to do it. You don't just call.
As such a 20-something, I can attest that this is not universally true.
The male 20-somethings I know are largely chill and don't really care how a woman reaches out.
The female 20-somethings I know (both as friends and as romantic partners), on the other hand, universally prefer a text. They feel a phone call puts them on the spot; they call it "awkward" or "weird". In most cases, they'll only accept the phone call if they're already into the guy. If they're unsure about the guy, he's probably ensured he's going to get a negative response.
And, of course, this is probably not universally true of all female 20-somethings, but if you are courting, it's better to play the game by the numbers.
After the initial courting phase, I've found things to be a bit different and more dependent upon the individual. That's the time to show your own preferences rather than play the game.