How many of you have discovered perfect locations for a harbour only to have your plans foiled by reefs? Yes Reefs. What is their purpose in game balance really that they tend to conveniently appear in extremely inconvenient places? To foil adjacency bonuses? To block Polder Placement? To ensure the coast will never be too productive? That and the luxuries and strategic resources that appear at perfect locations for campus/holy site districts. There really should be a code that prevents this it totally ruins the experience of planning like a speck of dung on a delicious cake. +5 Science for a campus? Nope let's have tea instead ! Some excessive iron sounds pretty good too. That or players should be able to build districts over them at a designated price. Removing them entirely as with jungle and marshes seem perfectly fair too. The question at the end of the day is whether the devs want to prevent players from accidentally removing important resources or faciliate better planning by players by removing the guard against careless mistakes like these. The extra quantities of strategic/luxury resources already doesn't matter much at all in Civ 6 I don't see any justifiable reason why they too cannot be removed.