Take Careful Strike, for instance. It was completely inobvious that Twin Strike was hands-down a better choice. Regardless of what the bad-mouthers might contend, there's no way they could have made that determination during the playtesting and design stages. This is all more art than science after all, with little math involved.
Err, no.
Sorry, but this is all Math 101.
Grab a spreadsheet, put a few cells in it, bang. Twin Strike kicks Careful Strike butt by 13% before even getting to better weapons and feats and magic items.
Design is supposed to include math, not just be an artsey fartsey based rule of thumb. And what might have been inobvious to you might be obvious to others. .5(b+m)+.5(b+m)+.75q > .6(b+m+d+q) where b = bow damage, m = magic, q = quarry, and d= dex for b = 5.5, m = 0 to 2, q = 3.5, and d = 4 to 5 at herioc levels (not even including increased number of criticals). Algebra is pretty easy too.
Every power and feat and class ability during design should go through a spreadsheet with a variety of options thrown on. The math is critically important.
This is why heavy Armor AC was fixed in AV and why the Expertise feats showed up.