Security model of banks is completely different from everything else. They will only consider 2FA if the total calculated cost /to them/ becomes significant if they don't.
...and if they were to offer a more advanced 2fa option, it'd possibly only appeal to a niche of users that wouldn't significant change (improve) their calculated cost?
That's why they probably wouldn't roll out to a voluntary subset on regular accounts.
Tbf, I've had a handful accounts in a few different countries. I've had proper 2FA in most of them (the one I've started with around 2005 uses printed one use codes), SMS codes in one and no 2FA in one.
