He talks about IMAX like it's the ultimate in filmmaking, but filming, editing, & projecting IMAX is a horribly inconvenient & expensive process.
The reels of film are so huge & heavy that they require loads of special equipment to assemble & move.
The cameras are so loud that they had to build a gigantic soundproof shell around them to film dialogue scenes. The shell around the camera was so huge that they had to use mirrors so the actors could see their scene partners around the camera.