FDIC is great, sure. But there's a significant difference in risk in having $500 in Amazon gift cards versus that store in the dying mall that's probably going to be gone in six months. And it's reasonable to try to figure out which one Coinbase is.

There are many value that are neither trivial nor worth the effort of upgrading from pretty safe storage to completely safe storage.

These have nothing to do with each other.

It's a very direct analogy about safety of money-like assets.

Sometimes things are not pocket change but also not worth insuring.

I don't think the advice to never have an uninsured balance is helpful to the question that was asked.