Any reason to buy a refundable ticket if I’m paying with the Chase Explorer Card?

I had to cancel a trip recently, unexpectedly and at the last minute. I’d bought United flight tickets at the refundable rate using the Chase Explorer card.

The fares were refunded as soon as I cancelled. But the experience caused me to do a deep dive into the travel insurance provided by the credit card, and it seems to cover airfare. Anyone have information or an experience to share?