[smnrchrds]

> Specifying custom fonts is largely a waste of bandwidth for a very marginal improvement in aesthetic.

Perhaps for English and other Latin-based alphabets. But for some other writing systems, system fonts are simply terrible.

[Flimm]

I completely agree. System fonts render Arabic very differently on Windows, on Chrome OS and on Ubuntu, for instance, so differently that you feel you need to adjust the font size depending on the font being used.