The desiribility of an investment(blackjack) is judge by its ev+risk.
EV is easy to understand,most likely outcome. The important thing to consider here is time. In bj time equals number of hands.
Before taking on any investment or playing any game, one needs to consider WHEN one plans to "cash in". Time affects not only strategy but also risk, ever heard of "shares are for the longrun".
Progressions are short run strategies. Counting longrun. But without considering when to quit, one is as good as another. Counting can be negative ev if one plays only 1 hand. Because the ev is more than offset by the cash paid to food to fuel your brain, especially during learning process. Also the huge variance on 1hand.
We have many limited resources, time, energy, etc.
Relative to all endeavors, payoffs may be a combination of pleasure or profit.
Determine what the goal is + the time allow. There is more to invest than money.