Edit: Now that I read the source in Japanese he could possibly mean that there's just a lot of actions with varying recast timers so it's hard to tell how to line them up (it's not but people playing this game don't often have lights upstairs).
The wording use is that recast timers were "all over the place" (バラバラ. Eh. Still doesn't sound right.
I think that's a fair assessment of what he said, but I might interpret it as something like, "People familiar enough with the class were able to output huge amounts of burst damage, but it required extensive use of a large number of cross-class (additional) skills each with their own cooldowns. This made it difficult to tell what needed to be used when..."
By itself, sure, there will be people who roll their eyes with the obligatory "Oh, Yoshida...", but you need to take into account the context. If you are completely familiar with the class, then you fall into the group of people that could consistently (within the parameters of the class) deal large amounts of burst damage. However, one of the goals of this expansion has been to lower the skill floor--or at least reduce the (DPS) gap between poor-average and skilled players. (I imagine that) for someone just picking up the class, messing up their Wildfire proc meant that they were really dealing mediocre damage, so becoming familiar enough with the class often required more time than a newer player was willing to invest. Rather, they'd probably try Mach in a group, embarrass themselves with poor DPS, and then quit the class for something easier.
So instead, they've reworked the class around this heat mechanic.
Disclaimer: I've never touched the Mach class, so I don't know how it works. I do know that my experience with NIN was similar, and I posted mediocre damage for a looong time before I got used to working in Suiton / Trick Attack while managing my cooldowns to keep debuffs and dots up.
