I think illusionism is less fun and actually more stressful for me as a dm. I found myself guiding players toward prepared content, and then presenting that content rather than playing it, if that makes sense. It's the difference from the role of the dm to curate an experience vs the dm to be a particular kind of player who also gets to be surprised.Oh, this thread again. It took surprisingly many pages until we got to the terrible thought crime of illusionism. Seriously, whether the ogres were always meant to be on one path, were moved, made up on the spot or were in some vague state between these is information that only exists in the GM's noggin and will not affect the experience of the players one bit.
As a player I've had dms that say, 'it's a sandbox! you can do anything!' But then still have an idea of what they would prefer you to do, and so it becomes guess what this dm wants us to do.