ok sabatini looks good.
this seems to be a similar debate to all the fh threads... when equipment allows, player will find the most effective way...
i have always said the lack of supination was not that the past players didn't know how to do it, it was due the limitation of small heads.
so back to the point - why is the old fart way still so popular... even the 2 guys in that college video you gave link to... if they take a swing path like sabatini's, both can improve that shot by big margin.
reason is simple, the obsolete way is still being taught.