I think the most important quality of all is an ironclad control over emotions and tilt because once you're tilted, you lose everything you've learned about ranges, tells, calculations, etc.
I completely agree with what you say about tilt, it's a really important point, managing emotions during a tournament, and why this is important, because in many tournaments we will have a feeling of injustice, and what that means? Well poker is not fair, you enter with AK and lose to a QT and lose 80% of your stack close to the bubble, you really need nerves of steel, even more so if throughout the tournament you were cautious, so emotion is a crucial factor, stoicism would perhaps apply to this,
@Propane Goat, this point that you highlighted is interesting, it is really important, another factor that I also consider is patience, because in most tournaments you will have to fold many, many
hands when they don't arrive, watching your opponents double their chips by playing the wrong way, so poker really is a trial by fire, if you don't have emotional management it's difficult to be successful.