Your potential customers are the ones to ask. The opinions here will be varied, and unhelpful.
Unless your target market is HN folks. If it is, you're absolutely in the right place and ignore everything I said.
replies(1):
Of course, many established companies offer SSO, ability to login using Google, Apple, other oauth.
I asked around to my test users and a few potential users and they mentioned email is fine. In my own experience as a SWE I used many softwares at work which used just email login. However, many more offered a bunch more.
Will it be fine to open it up to broader audience without all these things?