For someone I've never spoken to or even noticed posting here, you seem to have developed a strong dislike for me. And no, they're not "foolish" or "disorganized" (odd that you should critique non-ordinary use and then say "unorganized), they're merely stylistic choices, and legitimate ones. "Firstly" is hardly Shakespearean. This practice of calling people out on archaic rules that were never rules to begin with and whose application now is laughable makes you an academic prig, not to mention incorrect. This whole argument is of course irrelevant, but the point is, if you're going to characterize someone as being categorically wrong on a point, you'd better know what you're talking about, and here, you didn't. Neither "first" nor "firstly" is right. Neither is wrong. This is the case whether we're talking about modern or traditional usage. You'll find grammarians on both sides of the issue, but as always, the OED is law.
And who the hell are you to tell people they can't say "thither"?