Or worse, "SSO" as an Enterprise feature. You're a 2-3 person startup, you set up GSuite, you want to set things up right, oh, "$Call us" for a tier with SSO. Nope, I guess disparate users for now. Not the worst in the world to be clear, but an entirely arbitrary gate, in my experience.
I have long held that view also, although the post below about the cost of supporting SSO was interesting. Unlike withholding SOC2 reports which cost nothing to incremental to give to your lowest tier, SSO may increase the cost of support. I wonder how it would go offering SSO as an addon to entry level tiers that covers the incremental support cost.