alt Hacker NewsBankID is not a government thing, it's developed by a company founded by a bank consortium. Once upon a time the state aimed to build an public good in this space but bank representatives in the committee responsible managed to block it.
I was under the impression that it doesn't work under GrapheneOS, great news that it does. Other than that it shares some of the characteristics detailed above, refusing to run if it notices rooting and the like. Also no Linux support.
Edit: I agree that it has a convenience to it, but I strongly suspect it has a latent tyrannical potential and that future governments will exploit this to a further degree.
BankID also doesn't have Windows support. There's a defunct app that used smart-cards but it's fully deprecated and does not function.
But yes, it's owned by the banks not the state; if anything though this increases its weakness.
You can use BankID to identify with the tax agency, the public health services and police. (and more: this is just what I'm aware of) and there's an expectation that you have a BankID.