In Soyuz capsules, there's an interesting evolution that went on:
First there were 3 cosmonauts with normal outfits, then only 2 with a pressure suit. After about 10 years, they were back with 3 cosmonauts with pressure suits (the "T" version) and all 3 were active in piloting the spacecraft. 20 years later, the TMA version allows the third participant to be a passenger without much training and things to do to pilot the spacecraft.

It is interesting to see another trend. Test pilots began the programs.
Then normal pilots while test pilots thought little of them. Then scientists and pilots thought little of them.
Then now, passengers while "professionnal astronauts" think little of them.

Who really qualifies?

Spacecrafts are meant to work in space and spend very little time in atmosphere. They are more and more automated and need less pilot skills and more of all kinds of qualities!