Pineapple remains the only sweet fruit I’ve ventured on a pizza but when you asked this my first guess would have been apple, especially because it pairs so well with pork so I’m surprised that made it to the bad idea category. Did anyone expand on why? I would have thought a pizza with almost any kind of pork but especially thick cut ham would be enhanced by a very sparing quantitiy of thin apple slices. I’d bet even some non-traditional cuts of pork might end up working well, like some thin strips of pork belly.
When tomatoes, olives, capsicum and zucchini are ‘fruit’ then the definition isn’t serving it’s purpose for anyone discussing cooking or eating or procuring those things. It’s a different meaning of the word that’s useful in particularly narrow settings but useless outside of those settings. The only reason people like to repeat the claims of ‘technically a fruit’ for various vegetables, outside of the context of maybe agriculture or scientific research or horticulture is because it’s amusingly counterintuitive and contrarian which is exactly why it should be disregarded.