For a long time, I was using MAX 2013; it was all I could afford and I was in the middle of a huge project; trying to convert it to a new version of MAX before it was done seemed potentially problematic...and it all kinds of would have been. (The project is called "Quinn Redshift", and it's on YouTube; I won't post the link here, but if you like Star Wars-y sci-fi...) MAX completely gagged on most of my scenes because of deprecated functions and features.
One of the biggest challenges I face with MAX is that it tries so hard to make things look realistic that it becomes difficult to make something stylized or imaginative, and certainly not simply.
EXAMPLE: Making something glow, like a lightsaber blade, with more of a nimbus effect, where the glow stays the same size relative to the object rather than relative to the screen.
MentalRay had a "Glow" material that did this; it made the glow volumetric instead of a mere post effect.
I can't find anything equivalent in MAX 2023; as near as I can tell, only MentalRay did this.
I can try the scene converter again, but MAX acts like it has no idea what the Glow material ever was.