Grievous wounds should be part of rune page

As the game is, a lot of champions can abuse sustain and because of this sustain abuse become problematic. while grievous wounds exist in the game it often too much of a hassle and very inconvenient to go into. Mages only way to access grievous is through morellonomicon itemization which is a high prized 3k item that you won't afford if you get pummeled. Tanks and bruisers need bramable which build into thorns but again isn't useful unless you are purely armor stacking. The only gold efficient use of grievous is executioners blade with still has a 1k drawback from the main build.If we let grievous become a rune it'll give more flexibility when playing against champions like Vlad,Soroka,Olaf and will make them less problematic for the early phase of the game while costing a rune to level off power. I feel this would make the game better and not allow theses people to become crazy fed early because of their design adv over other champions.