On hit interactions aren't Consistent

In this game when you Use on hit and specifically Guinsoo's Rageblade Guinsoo's Rage interaction and Renekton's Ruthless Predator interaction that proc extra on hit effects for things like Wit's End and Blade of the Ruined King passives. Why don't they proc multiple times for the Rune Bone Plating and for Thornmail. Both of these double hit effects are supposed to be individual applications of damage. Tripple hit on Renekton. They are supposed to work like Master Yi's passive does. Id very much like these long time interactions to be fixed as they are described especially with how bad defensive items feel to build and even worse for the Fighter who doesnt build full defense and titanic if they arent Riven Yasou, Firoa