Tallit katan for sephardim


From what I understand, the tradition of Sephardim was to either wear a Tallit Gadol all day or nothing at all, only Torah scholars would wear Tallit Kattan. In fact, some Sephardic poskim, like Rav Messas, paskened that sephardim who are not Torah scholars should avoid wearing a tallit katan.

What is the position of the Rav on this matter nowadays?


Sephardim like Ashkenazim should wear talit katan all day everyday. (One may take off their talit katan when exercising for example, where they will get smelly or ruined by sweat).

Whats the reasoning that Rav Messas says non scholars should avoid wearing talit katan? Is this written somewhere?