Does using a parralel tip shaft into a taper tip hosel affect anything?

Yes, using a parallel tip shaft in a taper tip hosel can affect the performance of the club. The fit may be loose, leading to instability and inconsistent performance due to improper seating. Additionally, it could alter the club's flex and kick point, impacting feel and trajectory. It's generally recommended to use shafts that match the hosel type for optimal performance.