[meerita]

Roboto is installed default on many systems, specially on phones. The speed factor to me is key. That's why I avoid using webfonts. I use both San Francisco for those on Mac and iOS and Roboto for the rest of the mortals, including other san-serifs.

[RobertKerans]

One system (Android), not many.

[meerita]

Yes, but accounts my 65% of visits. I use other system fonts as a fallback.