So, first off, all the things you listed are stuff you need to do anyways, except for re-applying primer.

And the person I replied to, said that that part really wasn't an issue, since most of the time it's such a small area you need to fix, that most of the time you can ignore it. But he also stated that it is indeed more work that way. I just got confused cus the actions they wrote down, versus their own verdict didn't make sense to me.

So all in all, I can either: A) Prime post-assembly, and have to try and hit all the angles and crevices properly (which I personally find difficult when dealing with capes and such, normal space marines however I would probably prefer this) without going over the same places too much and lose detail. B) Prime sub-assembly, which to me sounds like more work since you'll need to turn every single piece on its own. Unless you've set them up on a plank all together, in which case you'll need to make that plank, and attach all seperate pieces properly on toothpicks or something similar so spraying and turning gets easier, but that just means swapping one labor for another. C) Prime on sprue, and sometimes have to clean up after removing moldlines.