I can't say they're always pleasant memories, but the are memories that left an impression. I think sometimes them leaving a strong impression is good enough. Not every memory has to be a good one.

[And while he would not wish suffering upon anyone, he can understand that life is not without hardships. He knows his own hardships is why he can appreciate what joys his life now has.]

You travel from world to world regularly then? That's what it sounds like. [The concept might be foreign if not for the fact that the Traveler has came and gone and that Teyvat's history basically lends to the concept.] You must have experienced a lot through your life.