This is the same train of thought that I subscribe to. Unfortunately it works both ways. Getting ascended gear slows the progression towards a legendary. From what I've heard, getting the crafting profession from 450-500 alone is a massive gold sink. While getting a legendary, which is grotesquely expensive, hinders progress towards getting ascended gear after that. It really boils down to the individual's decision in the end. But really, after feeling the sting of my exotic gear (which is all nicely transmuted) no longer being BIS, I'm just not willing to grind out this ascended gear, transmute again, only to have it made redundant.
Expensive as it was, it was far more worth it for me to get a legendary and ignore ascended gear, at least for now. It's future-proof gear, and some of them have nice skins and effects. Let's not forget of course, legendary armor, which could happen in the future.