The choice of login provider is one of a few consequential things - for most tech services, it's extremely important to minimise friction and get people to use

The choice of login provider is one of a few consequential things - for most tech services, it's extremely important to minimise friction and get people to use your service. If you've decided on Google+ as your login provider, your bounce-out rate is going to be particularly high, for several reasons including the parent poster's point. That could still be the right decision for you, but it's worth worrying about.