The thing is, "better" is an ambiguous word. I can change a program in some way and make it smaller. I can change it in some other way and make it faster. Both are "better", but in different ways. More often than not, however, you can't have both smaller and faster - or else your are just fixing a performance bug. Often even improving one property makes some other property less good, as you can see in the numerous "pick two" rules.

So "better" means "more specialized" more often that it means "more optimized". I don't say it is a bad thing per se, but it is best to keep in mind that they are two types of improvement, fixes and specializations, because the latter is a commitment.