A normal broker should have all client accounts in segregated bank accounts, separate from the broker's operating capital. There is no excuse for a modern day broker with all it's tools for not processing withdrawals in a timely manner. Sure, they can claim that it may take more time due to high volume of withdrawals but if they can't provide a reasonable solution, or an expected date, then there's a high probably that their client funds are not properly segregated.
And ignoring any further communications after a withdrawal request is the trademark of a scam broker, who parks all orders on a demo server hoping clients will lose all their hypothetical money.
So what good is a broker that does not process withdrawals? About as useless as a plastic broker at a paper trading competition.