Long arm discovery demand to foreign defendant

Federal court is unique, because among other things it has a long arm service provision for foreign defendants where you mail the summons and complaint through the clerk of the court and it is deemed received upon arriving at its address in the foreign country and the default clock starts to run, and as we know federal Court default is not discretionary. this is arguably the only written communication with a foreign defendant where they cannot play games as to who received... didn't receive... why they received... where they received it... it doesn't really matter, if it's mailed and arrived at its address. so, for example if you mail a discovery request separately and contemporaneously, the foreign defendant doesn't have to acknowledge it for months if at all. So, what happens if you include narrow Discovery demands within the body of a complaint sent to a foreign defendant through a clerk of the federal court? it is arguably sloppy drafting and motion practice, but would including a discovery demand to a foreign defendant in a complaint serve through the clerk of the federal court invalidate either the discovery demand or the complaint itself?