One of the most troubling decisions is to design your opening repertoire. The idea of having a perfect set of weapons against each of the opponent’s possible choices gives us peace of mind. However, there is a huge gap between how we picture this in our head and how it actually works in practice.
We see openings (our repertoire) as something fixed where ideally we would obtain a comfortable position each time and sometimes if we are lucky, we can get even an advantage. I would say that nowadays this rather sounds like wishful thinking and not very practical.