Having something to look forward is great. Hope is what fuels every human being and inspires us to wake up and leave our beds every morning. However, looking forward can be counter-productive if taken too far. When one is always thinking of what to say next in a conversation, they are essentially absent from it.
What we take out of an experience is a combination of how it can potentially make us feel and the quality of attention we bring to it. When our mind is constantly running a script on how the next steps ought to look like, some of our mental resources are stuck in constructing a story in the future that takes us away from the present moment.
And when we do that, we are missing out on enjoying it to the fullest.