If I have to use another knife to wipe the blade of the Premium Finishing Knife, doesn't using these knives make me take longer to complete a job?

If you are using the knives to wipe down behind automatic taping and finishing tools, very little material is removed and a smaller knife can be used with a mud pan.  If you are using the knives to finish by hand, using an additional small knife to wipe excess material will not require additional time to complete the job.