Your refering to 1-minute of casting as "hardly 30 seconds of combat" doesn't exactly inspire confidence that you are approaching this in good faith. But let's talk in spite of that.
If you truly think that the video I provided was "armchair", my best guess is that you don't know what armchair means in this context. Which is fair enough, nobody knows every word. I'll just cut from Wikipedia to make it easy:
Armchair theorizing, also known as armchair philosophizing or armchair scholarship, is an approach to providing new developments in a field that does not involve primary research or data collection.
So what I did wasn't "armchair" by any stretch of the imagination, as I actually collected data.
With respect, what you're proposing would make an exceedingly poor experiment. A good experiment aims to be as simple as possible so that it can reduce the likelihood of confounding variables. To engage in a full duty would add a ton of unnecessary confounding variables to the experiment.
And even a lay-person should be able to see why that is. Every time you complete a duty, you're going to do something at least slightly differently. You won't move into the exact same place at the exact same time, an ability might target you during one fight but not target you during the next, and of course, there's always human error. Which leads to the question of whether any differences were due to the thing you were trying to measure, or because of these other factors.
That's why a well-designed experiment will reduce the complexity of the the system being analyzed via strict control, to reduce the likelihood that the results are being impacted by multiple forces, which would make it more difficult to distinguish what the actual cause for any disparity was.
So if you want to determine whether macros innately result in action loss, then the experiment I've already done has a far more effective methodology than what you're suggesting.