I'm repeating myself here and apologize for it, but I think it's worth keeping this on your mind in these discussions:

https://news.ycombinator.com/item?id=29892664

The SSO tax is obnoxious and it's obvious why everyone hates it, especially security professionals. But it has nothing to do with the cost of providing SSO features, and everything to do with market segmentation: by raising prices for large organizations (who reliably signal themselves by requiring SSO), you can cut or eliminate prices for small organizations. People who demand SSO are, essentially, flying business class, and paying for the back of the plane.