Yes, topworked trees of any kind need to be watched with hawk eyes, and need to be pruned, usually more than once a year, to make sure that the original tree doesn't produce water suckers and other vigorous growth--- otherwise, topwork grafts will be shaded over and starved out in rather short order.
Even normal low grafts can be subjected to similar circumstances--- when storms lean the tree sideways, or when pests or diseases or cold stress the top of the tree, suckers appear under the graft union, and usually grow vigorously. If no one who knows what to do is looking, the grafts' tops cease to exist or at least become of little use.
I often find Citrus trees in such conditons in my new customers' yards.