I don't think that... generally, nor specifically in the case of Ender... that it is about wanting to personally have some kind of total spectrum experience of all possible experiences, as some kind of... maximalist sensory/mindstate fetish kind of thing.

There for sure are probably some people like that, but I'd say thats very uncommon.

What I think is more commone is two things:

Despite having base tendencies we often fall back to, humans just vary, significantly, in terms of how they tend to act toward others.

and

People are capable of actual, real world character development, of doing something and thinking it was good at the time... and realize they were wrong, learning, growing, changing, maybe not in totality, but in very significant and impactful ways.

This is not often as common or extreme in the real world as it is in our stories... but that we emphasize this in our stories also means something about us.

It is about a wide spectrum of potential in all humans, not necessarily a single person exhibiting the whole spectrum, not out of some kind of... experiential hedonism.

At least, thats how I see it.

Another defining trait of humans is that we will do things explicitly against our own self interest, out of an adherence to a moral doctrine or dogma, or, making ones own moral decisions about what is wrong and right, to the point of great personal sacrifice.