Cuz, for clarification, the “pros“ usually add oak powder during fermentation added right to the must prior to inoculating with yeast. The powder adds body and tanin structure as others noted, but does not add oak flavor. At the completion of fermentation and while aging, oak can be added for flavor usually either by using an oak barrel (best) or toasted oak cubes ( next best) or oak chips. This oak must remain in the wine for extended periods in order to get the benefit (many weeks or better yet months).
in regards to using red oak, around here we refer to it as “piss oak” for exactly the reasons noted by others. I would never let that anywhere near my wine!