Well, for those who want to sit there all day focussing and timing trades, then that's fine. But in my experience, there is a danger of trying to justify computer screen time to making profits.
I can't be bothered with all that frankly given that it is extremely time consuming and that every decision is still a less than 50% chance of being correct successful. Success in the sense that it was the correct decision at the right time and price both for entry and exit...let alone correct stop placement and so on.
All I'm saying is, it's perfectly possible to keep playing the bias stake game until you reach a point of profit overall. It doesn't mean that we have to keep on adding trades ad-infinitum. We can always close off profitable trades when we decide the bias has shifted to the other side, and maybe back again and so on. It's just totally flexible in that sense.