There doesn’t need to be a real reason, sometimes we do things just because we feel like doing them.
This all sounds like good, but it isn't.
What if we need to feel a purpose to do things? I am not a hoarder, just because of this reason. I only play or buy games that me or my children would play. Because hoarding, for the sake of hoarding doesn't make sense to me.
You say that we don't need to have an excuse to do things you do, and I disagree with that, because to feel good about my actions, I need to make sense of my actions. Otherwise it all feels purposeless.