I think it is the fact that you can deepen your thinking.
A person who has just started Go and a master player can each enjoy Go at his or her own level. That's because you can work out a plan that suits you, try it out on the Go board, and find out its merits and demerits. A defective plan will benefit the opponent and fail to secure a good result. However, it will make your opponent very happy, so this is the "hospitality" of Go.

Fail with a big invasion and die on a large scale.

That's what may happen. By playing Go, you learn the areas in which you are i nadequate, and by deepening your thinking, not only do you improve your skill, you can also experience personal growth. I think that this is the irreplaceab le pleasure of Go.