The phrase "superfluous features" refers to unnecessary or extra elements that are not needed or helpful in a certain situation or object. It means that these features are excessive, not important, or don't serve a useful purpose. Full definition
The bells and whistles are all stock, but sometimes it's the simplicity, the lack of superfluous features that makes something truly elegant. (pocketnow.com)
It's also not complicated by adding superfluous features to pad out the spec sheet. (pocket-lint.com)
During the company's F8 keynote, Mark Zuckerberg announced that it's going to «completely redesign Messenger» to give its users a «simple and fast experience,» following years of jamming the app with superfluous features like video games. (techtimes.com)