Hi Lukas schubsda! I tried to say “be very skeptical and challenge any assumption” even my assumptions. But I guess my Urban Dictionary translation obscured my message.

I was a bit lazy to give you some pointers on the research that gives more background on the statement.

Luckily Roel Willems (and you yourself) came up with some good points.

Thank you both! I also like this take indeed by Kahneman

https://hbr.org/2011/06/the-big-idea-before-you-make-that-big-decision/ar/1

And biases in relation to running experiments or run business in general deserve an own post. Will start working on it.