Prime focus lens is simple to use in the sense that you do not have to (cannot) zoom, they are great in terms of quality. Modern zoom can come close, but for demanding applications like astrophotography (absolute point light source), prime lens is the choice.
However, for daily purpose, as you will know, prime lens could be very hard to use especially when you have to catch some special moments. In that case, you cannot afford the time to swap your lenses, but for static targets, they're still superb!
Some people might think prime lenses would limit your creativity since they are not so flexible, however, I would say the more limited the situation, you will even need more creativity. I would say it's another world entirely.