Nerfing Skirmisher's Damage Will Not Bring Them Away From Tank Builds!!
The reason tank Yasuo and Ekko are so popular is because their primarily damage focused kits do not provide sustain or reliable resistances. With no means of natural survivability, which is absolutely critical for a skirmisher, players are needing to purchase it from items. With the near extinction of spell vamp Ekko is pretty much forced to have more resistances than sustainability. Yasuo does have the ability to benefit more heavily from AD items so an AD sustain build including lifesteal is certainly possible for him, but tank items are just strong right now.
NERFING THEIR DAMAGE WILL NOT WORK.
Not having the ability to deal enough damage in a short enough time is what is causing the need to buy sustainability. They have already tried this with Ekko and guess what, tank Ekko is still a problem. They need to BUFF their sustainability through their natural kit. Encourage players to purchase offensive items in order to deal sustainable damage without being destroyed too quickly.