When aircraft sit for prolonged periods of time, very bad things happen, especially in harsh environments.
In the unfortunate event of damage to your aircraft, hull insurance should pay for repairs, but unless you have additional Diminution of Value protection, it will not cover the loss created by documented damage history.
If (or when) your aircraft is damaged, appropriate hull insurance coverage will pay to physically restore the aircraft to a serviceable condition. If you intend to keep that aircraft for the duration of its useful life, repair is probably sufficient. But what if you want or need to sell the aircraft ?