If you ran a prop firm that fully funded the traders, would you be looking for anything less than the top 1%?
I believe TopStep allows you to design a custom combine.
That's a good point

As you know, I am developing & trading fully automated systems ... I can either meet the P&L target, but need a larger DD to have a good statistical chance of passing, or I can meet the DD limit, but need a reduced P&L target.
Else, I play the Combine until the system finds a time window where it passes - but that's not statistically significant.
Anyway, my point was, over a period of 20 days, there is no way TST can make the difference between someone passing by luck, or someone being a true star.
What I believe, is that this Combine is as much of a money making machine for them, as it is of a selection tool. Good for them.