On September 22, 2017, Nintendo released two-factor authentication for Nintendo accounts. The system uses Google’s 2FA system (so it would also work with the LastPass authenticator, which is what I generally use).
So at this point, my Nintendo account is more secure than my bank account. My bank doesn’t offer any form of routine 2FA, despite me constantly harassing them about adding it.
And really, even 2FA isn’t good enough when it comes to banking. There’s no reason banks and credit unions shouldn’t offer their customers the option of using U2F.