I'm a manual guy too, but I'd like to see this run by someone who is more familiar and comfortable with the PDK for a fairer comparison.But this video just annoys me. He never got comfortable in the PDK, and was clearly "fighting" the PDK during his supposedly fast lap. I think that if he spent a little more time with the PDK and got really comfortable with it's operation before trying his fast lap, he'd find the results to be a lot closer.
The facts are that PDK does shift faster gear to gear than is possible with a Manual, and the PDK protects against accidental over-revs that can occur when downshifting a Manual. After that, it's all what you are most comfortable with . . .
I'm not sure I would describe it as "over cautious" - it is merely waiting until the speed (drivetrain rpms) is low enough to match the engine rpms without going over the redline (which is what you should be doing with a MT anyway). Since it downshifts sequentially through the gears, you can preselect your next gear by tapping the downshift button as many times as you want, and it will get there as soon as feasible. For example, if you are in 5th gear, and want to be in 2nd on exiting a turn, you can just tap it 3 times in a row.Isn't that the point though, if the PDK is over cautious on when it downshifts, then your going into the next corner in the wrong gear of without confidence, either way it doesn’t help lap times.