Would you have the CEO scrubbing the bathroom floors? How about the custodian meeting with major donors? No, because those are the custodian’s and development officer’s responsibilities, respectively. Or, for those outside of the corporate scope, let’s look at your home: Would you hire an electrician to fix your plumbing? So why have someone who is not qualified to edit be in charge of proof reading?
Let people do their jobs effectively and maximize their efficency then allow them to do their jobs (as assigned) efficently and effectively. If you hinder them from doing so, don’t complain when they aren’t meeting their goals.
Make professional development a priority.