I like what Redis does, and it's also heavily used in industry. What I am saying, not incorrectly, is that their approach to security is harmful to their users. Most of whom won't know, care, or implement additional security which they should.
It's the same argument with HTTPS. Of course HTTPS is optional in a web server, but all major web servers support HTTPS, and there has been a concentrated push to have more people using SSL.
e.g. LetsEncrypt
We should be making it easier for people to deploy secure services. Redis' approach to security makes it extremely difficult for developers to deploy secure services.
I'll say it again: It's irresponsible in 2016/2017 to assume you have impenetrable perimeter security.