As a player that gets frustrated over the carusel like every second game I must disagree.
Sometimes I only need that 1single Item(eg needlessly for my spatula) to get 6/6sorcerer, so it would be a gamechanger, but that needlessly large rod doesnt show up... for 2carusels.
Am I frustrated then? Yes.
Is it okay tho? Yes.
If I rely on a single Item so heavily that my entire comb falls apart if I do not get that one particular item, then maybe my comb sucks.
If my Volibear does not get Rapidfire he's just half as deadly. And that's fine.
Do not rely on the carusel, not even when you are 8th place. Be assured that the 7th place dude will be closer to the item you really need and he IS GOING TO take it. That being if the Item even shows up in the first place. Sometimes people just stand around not knowing what they want, they will wait for your turn because they got 0plan on what to build, but the moment they see what item you are going for they will take it.
Carusel is basically hell.
I've heard this a lot in the forums so im just going to repeat it:
work with what you have, not with what you dont have.