the only reason those champions are impacted by this is because the way it stacks with them, they passively farm as they way for the con to stack up, this affected Yi mains and Fiora mains too, but they are not that impact-ful, This rune was meant for Skirmishers who can deal with long enduring fights, after doing those long enduring fights they are suppose to be rewarded with more INCREASE SUSTAIN DAMAGE, meaning more DPS that can shred through, and sustain within those DPS. Irelia has attack speed steroid, meaning this wont come online automatically, you will need to make sure you act like a skirmisher, but a BURSTY DPS like certain champions were back a season or two ago. example being vayne one shotting any squishy champion and jhin doing the same thing with lethality and crit combo.
let me explain this in a short matter, Irelia already has a stacking system in her passive, giving her bonus attack speed at max level, this with her abilities can easily get her the ability to give her con stacks, Jax too, has a stacking passive which with his QWE combo can easily stack his con too, Darius has a different story, while he can be consider as skirmisher, he not, he is a lane bully and thus you need to encourage that kind of play since he doesn't do a crap ton over the extent of a battle, his whole kit is based off of getting his passive to the max, which is why conqueror doesn't fit this, brings in too much risk into a darius all to just increase his damage that is already there, he doesn't even need it. Draven on the other hand shouldn't had taken this