This debate has always been stupid and people love to jump on the band wagon of hating pineapple on pizza.
Truth is, pineapple on pizza is great when caramelized properly. Pineapple balances out saltiness, which is something most people don’t appreciate because most people know nothing about proper balance when it comes to food. Problem is, most places don’t cook the pineapple properly. Of course, pineapple doesn’t belong on EVERY pizza, but the fun thing about pizza is there’s unlimited recipes. You can put ANYTHING on a pizza as long as the ingredients complement each other. One of the best pizzas I’ve ever had was in Madrid and was topped with green apples. Sounds tart, tasted fantastic.
This leads to an interesting spinoff question: what's the most unusual pizza topping you've ever had? For me it's lobster, on the island of Bequia in the Grenadines.
For the original question, I'm fine with a ham and pineapple pizza.