Having race courses with different surfaces which significantly reward a bike change when the actual proess of changing bikes isn't a level playing field amongst racers is not right in my opinion. PC users can change much quicker than ATV users, and IT savvy PC users can do the change in seconds with one tap on the keyboard if they set up auto hotkeys in advance.
That said, if the bike change was the same for everyone and the course was borderline as to whether or not changing was the best option I think the tactical decision making involved could be fun
