Insurance Companies are your best friends
Most sailors will be surprised to learn that their policy will almost certainly have a "mechanical failure" exclusion. Trust me, if your throttle sticks open through no fault of your own and you wreck your boat, you will have no insurance coverage because the accident was caused by"mechanical failure." If your brand new rig comes down the first day you use it, expect denial of coverage for "mechanical failure." Insurance is ONLY useful for towing and general liability coverage.
It is important to recognize that insurance companies will deny any claim that they do not want to pay, regardless of any issue in the real world. If your boat is not worth much, don't expect the insurance company to pay you anything at all, no matter what the circumstances are. If your boat is worth a lot, don't expect a huge check without a fight.
Insurance companies like to present themselves as your buddy, but the only thing that any insurance company cares about is looking friendly for purposes of advertising and solicitation. No larger sharks exist in any ocean than these guys.
Paying claims is completely up to them, not you. If you don't like it, you can insure (har har) that justice will prevail if you litigate. Oh, and don't worry, if you sue your insurance company, they won't cancel your policy or tell any other insurance company about how much trouble you caused. I feel really warm and fuzzy when I think about insurance. They are such wonderful people.