Well i think that is the only thing that matters.
If I split all auth methods into the 6 different features it really is, then it becomes 13 free features.
The ones listed as not open source is to indicate what we plan to build for our paid offering. If we removed those and 13/13 were open source, would that change your views? If yes, then that qualification is pretty important.
SAML client and OAuth client are both free. You can add auth with any OAuth 2.0 provider to SuperTokens.
Being an OAuth 'provider' (emphasis) is not open source as it is a feature you need for complex use cases.
You can add 2FA with email or SMS in the open source product too (just requires some customizations and overrides)