I don't think there is anything wrong with choosing mechanical efficiency, and in point of fact I suspect the more you play the more you become accustomed to making selections based on it.I thought you were being critical of people who decline to build mechanically ineffective D&D characters. Whereas I tend to sympathise with them - D&D places a heavy priority on mechanical effectiveness. And modern versions also tend both to permit and to favour specialisation.
My only rolling of the eyes comes when players get upset that the designers release mechanics that they believe are too overpowered, and now they feel like they have no choice but to select those mechanics over any other "more fun" options. The whole 4E 'Weapon Expertise' fiasco for example. That it's on the designers to never release anything that could be considered "too good", because doing so shrinks player choice since now these options have to be selected since they are so good.
At some point, you have to take personal responsibility and decide that if you want to make a character choice for "fun" reasons, sometimes that means not making the "optimal" one. Because there is no single "optimal" path that is everybody's "fun" path too, which means WotC's job is impossible.