Definitely intentional. I'd like to note that this is a direct result of always increasing your two most important stats (which technically isn't something you absolutely have to do).
Technically you don't; but not doing so simply causes the problem for
other NAD's, not to mention virtually always reduces other combat-abilities. In all cases that I've seen fellow players actually do this (and there's been a few), without a single exception so far, doing so reduced the PC's effectiveness.
As value guesstimation, +1 AC >= 3x +1 NAD; +1 to hit ~= +1 AC + 3x+1 NAD >= 6x +1NAD; +1to-hit ~ +1 dmg; +1 primary stat mod ~ +1tohit + +1dmg + +1NAD (and sometimes more). I.e. very roughly, +1 primary stat mod ~ 13x +1NAD. Raising your primary ability on the order of ten times more attractive than merely raising a NAD by 1. Of course, Con, Dex & Int are somewhat special so this is only a very very rough guesstimate. That would suggest that it's generally very attractive to spend a mere 7 points to raise a point-buy 16 to 18 rather than 2 points to raise a 10 to a 12 - after all, that's 3.5 times more expensive, but gives ten times the value.
I'm sure you weren't suggesting people actually raise off-stats purely for NAD's, but seeing as I've had that happen in several parties I've been in, I now always feel obliged to point out that doing so is a very,
very bad idea unless you have some very special and well-thought out reason for doing so (and have considered the cost).
It's terribly easy to screw up a character by raising the wrong stats at levels 4/8. It's annoying because doing so screws up party balance; suddenly fairly normal characters can look quite overpowered without using any cheese.