There was a chap on here the other day who said they hate 2fa and don't need it because they use passwords that are 50 characters and generated by the password manager.
This is a perfect example of why you should always activate it when possible.
This isn't necessarily true. If you are using an identity provider, you can still perform a password reset on GitLab and set a password there, bypassing your 2FA on GitHub. You usually shouldnt rely on IdP 2FA unless the destination system enforces IdP signin every time. There is a group setting in GitLab that does that, but it will only apply for that group.
There was a chap on here the other day who said they hate 2fa and don't need it because they use passwords that are 50 characters and generated by the password manager.
This is a perfect example of why you should always activate it when possible.
I don't have 2FA for my GitLab account since it's only accesible via my GitHub account which has 2FA. Is this good or should I add 2FA to GitLab also?
If you have to use your GitHub 2fa to sign in that's fine I would assume.
This isn't necessarily true. If you are using an identity provider, you can still perform a password reset on GitLab and set a password there, bypassing your 2FA on GitHub. You usually shouldnt rely on IdP 2FA unless the destination system enforces IdP signin every time. There is a group setting in GitLab that does that, but it will only apply for that group.