Assalamualeikum @kouba01. Hope you are well. Absolutely, you have said a very good thing about imagination that we do not have any fear, we can imagine without fear and also said that imagination gives us happiness and we also become relaxed. Absolutely, I agree with you on this. And apart from this, imagination forces us to work to fulfill what we have imagined or to show progress.

Meaning, if we imagine something good, then we will work for it to achieve it and when we imagine anything, then we have to work hard to get the happiness that we get by imagining and we work hard so that we get that happiness by turning the imagination into reality.