There's a lot of things to argue about, but pizza just isn't one of them. It's a chunk of bread with leftovers on it. If it tastes good on pizza, it belongs on pizza; and what tastes good on pizza depends on the tongue probing it.
Pineapple... sausage... anchovies... goat cheese... potato chips... a fucking strawberry slurpee - if you like it, you rock it.
The only wrong option is to abstain from making/ordering the pizza you want because that ingredient doesn't 'belong' there.
For what is worth, that's not how (most?) Italians think about pizza. It's not a "container" in which you put a bunch of things, but each pizza type is basically a separate dish.
I personally don't care what people put on their pizza, I simply avoid places that make "pizzas" in a non-italian fashion, like the american (supposedly NY style) ones where you get crust, 2 fingers of industrial cheese and a whole plant of oregano.
It's very similar for pasta, which many people think as a bread replacement.
Most of Italian recipes are very simple. The focus usually is on quality on the ingredients and if they are good, a pizza with just mozzarella and tomatoes is already delicious. That said, even in Italy there are plenty of types of pizzas, but most of them don't have 20 ingredients, I suppose the point is that you actually want to taste what you eat, which is not the case when you mix many different things. There is a very messy and rich pizza (capricciosa) with a lot of toppings though (more than one obviously, but this is the most common).
Personally I am a margherita person, simple and boring is perfect, as long as it tastes great.
That makes sense. But also I find it amusing because Romans had the opposite attitude with food of “you know what everything I ever eat needs? A fuck ton of fermented fish sauce”. Which like, both attitudes are great, but it is an amusing evolution of culture over two millennia
Romans were food snobs too, though. One common insult was "chickpea-eater" because roasted chickpeas were poor people food. Thing is, roasted chickpeas are fucking delicious - I really wish fresh chickpeas in the pod were easier to find (in the US).
Preach. My favorite pizza of the last few years is with sliced kebap meat with sauce hollandaise. Sounds disgusting, looks not that appetizing but it's fucking amazing.
That's cuz you never had a proper napolitan pizza you uncultured swine. You'd never open your mouth about pizza again, or call anything you can buy in your America a pizza.