When making a Tax Category available to product types, what happens if those types are not resaved?

[johnnynotsolucky]

When changing the "Available to Product Types" field on a Tax Category, all products in for a type are resaved. That can take a while when you have a lot of products.

Looking at this code, it notes that the products must be resaved, but it doesn't say why:

commerce/src/services/TaxCategories.php

Lines 177 to 191 in c6f67e1

	foreach ($currentProductTypeIds as $oldProductTypeId) {
	// If we are removing a product type for this tax category the products of that type should be re-saved
	if (!in_array($oldProductTypeId, $newProductTypeIds, false)) {
	// Re-save all products that no longer have this tax category available to them
	$this->_resaveProductsByProductTypeId($oldProductTypeId);
	}
	}
	foreach ($newProductTypeIds as $newProductTypeId) {
	// If we are adding a product type for this tax category the products of that type should be re-saved
	if (!in_array($newProductTypeId, $currentProductTypeIds, false)) {
	// Re-save all products when assigning this tax category available to them
	$this->_resaveProductsByProductTypeId($newProductTypeId);
	}
	}

If the resave job doesn't run, everything seems to still work as before.

What happens if that job is released instead of executed?