I know how integral Rashi’s Torah Commentary is in the Askenaz community (in their Yeshivot they begin teaching it pretty much as soon as kids can read). I was wondering if this was also true in the Sephardi & Mizrachi world?
I will place as an illumination before me The lights of the pure candelabrum, The commentaries of our Rabbi Shlomo [Rashi], A crown of glory, and a diadem of beauty, Adorned in his ways, In Scripture, Mishnah and Gemara. The right of the first-born is his.
The primary commentary on Rashi was written by Rabbi Eliyahu Mizrachi, who was of Sephardic heritage.
In addition, the Shulchan Aruch rules that one can use Rashi instead of Targum Onkelos to review the weekly parsha. No other commentary has that status.
Rashi's commentary on the Torah and also on the Talmud is pretty much universally studied by all Jewish communities; even Yemenite communities printed Rashi in their Chumashim as you can see in this example here. Most of what Rashi says isn't his own idea anyway but rather quotations from various Midrashim familiar by all Jewish people regardless of location. By the way, before the age of enlightenment and the rise of the Reform Movement in Germany there was no such thing as the label "Orthodox". If you were a Jew, you were a Jew, and you either observed more or observed less.