Adding too much cheese can keep the the middle of the pizza from cooking properly, just like too much sauce or too many large chunks of vegetables with high water content. It takes a LOT of cheese to reach that point, but it is very possible when combined with the large chunks of vegetables.
Adding too much cheese can keep the the middle of the pizza from cooking properly, just like too much sauce or too many large chunks of vegetables with high water content. It takes a LOT of cheese to reach that point, but it is very possible when combined with the large chunks of vegetables.
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That could be a factor as well. Keeping the moisture in would keep the crust from drying on top of the increase thermal mass of the cheese itself.