On Smartphones bigger font size is much better readable and it makes buttons and tabs better usable.
Same time today the usual used desktop and laptop screens have much higher resolutions resulting in very tiny characters when viewing websites with pre-Bootstrap / pre-Responsive area "normal small" font sizes.
Thus I did testwise set body {font-size: 1.7em;} in custom CSS on doc.tiki.org and tiki.org
I'd personally would even prefer 1.8 em, but that might be too much for one or the other active community member (never argue about taste) and 1.6 em seems still a bit too small to have a useful effect.
Can be altered lateron. Feedback appreciated.
Best regards,
Torsten