Ask HN: Social Auth in 2017. Is it still a requirement?

What are you guys supporting as far as social auth these days? Is it still pulling larger conversions than local auth? Is local auth even needed anymore?

For every new project I start, I generally only support Facebook/Google and sometimes Twitter. Rarely do I ever add local authentication in the beginning, because it's one less aspect I have to deal with.

What's your experience? Does it hurt? Does it help? Do you personally use it, or do you prefer local auth?