True, however, the point is that most coverage is secondary to what is covered by the airline. If the airline reimburses you for any expenses (in the case of controllable delays), then the credit card insurers would deduct that amount.

However, in reality, airlines usually don't reimburse with cash. They may give you a voucher. So whatever you pay is already in excess of the voucher amount, or if you may choose not to use the hotel covered by voucher. Practically speaking, it may not matter.