Youmu's Ghostblade and Edge of Night

The only reason I can see why most of the lethality items are not melee only is because those items, especially , are used by so many champions to bring what little or no movement ability they have (primarily marksmen) up to par so they can at least keep up with the many newer forms of mobility introduced such as on Talon and Camille. Also because most ranged champions have no way to defend themselves besides distance, and again, with so many flanking movement abilities in the game now, even that defense is pretty weak. So things like EoN and DB help out with their outdated kit designed back when the support actually protected them, not competed with them to see who deals more damage. It is the reason we are seeing only 4 main ADCs champions in the LCS. Jhin, Ashe, Varus, and sometimes MF. They all have either added mobility or self peel (besides the fact that 3 of those 4 have massive poke range and/or damage). You are not seeing Jinx, Kog'maw, and Kalista get too many picks because none of them have simple and reliable self peel, or scale too late to be practical picks.