I've done this myself to a point, but the point I'm making is that there's so much of this flying around and so much debate about so many often-unsubstantiated 'optimizations' that there's often not any real reason to believe they are optimizations.

And if they're not, people are going to waste a lot of time trying to learn new habits, then find out that they are no better off or perhaps worse, except now they're stuck with new, bad habits to unlearn.

My argument is less with optimization than with spending too much time and effort attempting it without actually gaining anything, or having a reasonable expectation of the same.