This simply isn't true. The DRG channel literally spent an entire week running simulation tests on every potential GCD and gear combo to determine the best rotation and eventual BiS. They do this every expansion through ACT. The whole delayed Life window exists because of parse data showing it's better for DRG to delay Life of the Dragon. Combing through a cumbersome battle log would make finding min/max potential like this near impossible. At the absolute best case scenario, it'd increase their workload substantially for no intrinsic benefit. In fact, we'd likely have very little information going into the first Savage tier due to that alone. Sites like AhkMorning have down so far as finding the precise percentage vuln stacks and damage downs deal, which is also accomplished through ACT.
The operative word is "when" are they clearing content? If they're first Savage clear is week 4-6, it's entirely irrelevant to the conversation because they're above the ilvl requirement. That alone makes up for a lot of gameplay deficiencies, especially once you're getting tome weapons. I specifically mentioned Estinien in Dragonsong because of how tight the DPS check is. There's no gear available right now to offset gaps in job knowledge. Do you have to be perfect? No. You do, however, need to play the games at a high level, or have enough players playing near perfect. Accomplishing that comes through parsing because simply reading the tooltips won't teach you the nuances of how jobs functions.
Keep in mind, the devs have their own version of ACT. They aren't going through the content in the same manner we are. Nor would it be how they test it. Furthermore, their projection of when higher difficulty content should be cleared varies wildly from player perception. Yoshida statement never said when it can be cleared. Just that it can. Which brings us back to the ilvl argument. I'd also like to point out that at 6.05's release, a comp of PLD/NIN/DNC/MCH couldn't clear P4S. That's how poorly balanced those jobs were.