He probably means "a fantastic choice" for people who like or have no problem with good quality fonts, not for outliers.
I see no problem with "body text". In fact even tiny sized text on the size is still very legible, like the descriptions of operations in the "About" page.
No your parent is right, font replacement on windows still looks bad most of the time. Larger font sizes look a little less bad but there still exist rendering issues especially in chrome.
