Tons of good head coaches also call offensive plays. Off the top of my head: Lincoln Riley, Ryan Day, Mike Leach, Jimbo Fisher, Lane Kiffin, Jamey Chadwell, Chip Kelly (and Tom Osborne!) from college and Sean McVay, Kyle Shanahan, Jon Gruden, Andy Reid, Frank Reich, Doug Pederson (maybe not this year but he did win a SB!), and Kliff Kingsbury in the NFL.
I would rather our coach do what he's good at and the reason we hired him (the offense!) instead of mean mugging on the sideline watching the kickoff team or whatever to appease certain fans.