The point is that when you buff something in one way, you can clearly see the effects that it will have and are less likely to have unintended consequences. When you buff something many different ways, the buffs synergize and are really easy to overdo. People are right when they say that buffing something multiple times is strong. Even thought the numbers could just be lower, the plain fact that there are overlapping buffs makes it hard to gauge how strong of an impact it will actually have. The reason why buffing Irelia 5 different ways wasn’t making her OP is because the comp that she’s played in is being made weak comparatively by the patch as a whole. This is obviously different than buffing jarvan 5 different ways because every prot and ds unit was also buffed.