James McAvoy had to go bald for X-Men: Apocalypse, so that meant he had to shave his head. He didn’t trust anyone else with the electric razor, so he did it himself. You know what, if this acting thing doesn’t work out, he could so get a job as a military barber.
When it comes to his shiny chrome, he looks good with or without hair.
Just like the original Professor X aka Patrick Stewart, who watched as the younger version of his character transformed into him.