Optimists are always a little disappointed.
If you live with possibility, the idea that things can get better, that with consistent generous effort you can make a contribution, then you also end up feeling just a bit let down that it didn’t happen this time.
The alternative is to insist on limits, to be a pessimist, to simply play it as written and only do your job, expecting the worst.
Sure, you could probably avoid a little disappointment that way, but how could it be worth the journey? What’s the point of all this risk, effort and connection if we’re not going to use it in search of better?