Great video. My only addition is, that a winning player will have a much higher ROI in large field MTTs than in heads up SnGs or even 9 man SnGs, because each tournament provide more time to outplay the opposition. This will mitigate the effect of variance somewhat. But even if we plug in a ROI of 30%, there is still a high risk of losing over 1.000 tournaments, if the field is 1.000 players. And in corona virus times, many tournaments on PokerStars are way larger than that.
As for bankroll management I personally find, that 100 BI for 9 man SnGs and 300 BI for MTTs is a bit on the nitty side. Its probably good for professional players, but for part time players less will do, especially if they are willing to move down during a downswing. I would say maybe 50 BI for 9 man SnGs and 100 BI for MTTs but with the condition, that you keep your average buyin at less than 1%. So if for instance your bankroll is 500$, you should play a mixture of 2-5$ MTTs. A shot now and then is not a big deal either, as long as you keep it at no more than 2-3% of your bankroll.
