Reason why people using heavy braid because they want to have power to unsnag the swimbait from logs or something. Secondly, ensure that your swimbait has lot reduce chance to break off from casting. (swimbait cost lot of money!) Last of all, pull the fish fast and ensure release back without any fatigue or wear down like you do with 4-8lbs test line. This three reasons that I am being aware of it. Maybe more people can chime in more answer about it. I'm just started doing the swimbait.
I have Revo toro NaCl 61 and shamino sojourn 8ft rod. Rigged with 15 mono as backing and 150yds of 50lbs braid. So ready for this spring to come! Hi mommy, im coming for you! haha