It depends on how much money someone is holding. It's certain more secure than a single password on a banking site and your mother's maiden name.

Multisig allows for a possible catastrophic incident to occur—a fishing attack, a security vulnerability with your bitcoin wallet, loosing your pin, etc—and not lose your money.

A 2 of 3 multisig is something tech savvy people could easily do with a hardware wallet, a smartphone or computer and a safe deposit box, for example.

If you're a multinational corporation with over a $1 billion in bitcoin like MicroStrategy, it may make sense to have keys in different parts of the country or in different countries, especially if your adversaries are state level actors.