Your whole career is ahead of you. You've worked hard to get this far, and no doubt have plans for what you're going to do. The last thing you need is someone who derails your plans. That's why it's so important to interview your potential supervisors to determine if it will be a collaborative experience.
Of course the supervisor has to attend to board mandated activities, but they also have an obligation to provide a satisfactory supervision experience for you.
This is a mentorship relationship, and your professional growth is greatly impacted by the quality of the experience you have in supervision. There is room for your professional needs and concerns to be addressed.
It's your career your strategy is a major element in the supervision process.