To be fair poster said experienced and outgeared for said content, which the user of that youtube video clearly is. Also, as it stands, wouldn't tank be the only clear exception where there is leeway. However, ACN is the odd duck out in this scenario as no one can tell you what to do there. Some main spec smn (like I do) or sch and some split it even or any other combination they prefer to which no one can say they are wrong since SE forced a choice by having only one class branch into 2 jobs.