Probably because the transformation is terrible. Seriously, Look at this crap.
At 9:50 and 12:00 Dude has to do a bunch of steps in a very specific order, including moving stuff only partway, flipping a panel then undoing the first step, moving another panel, then moving the first part all the way. Then he has to do it all over again, for a single transformation between the carrier and city modes where the chest looks nearly identical except for the heliport. That would be bad enough doing it normally, let alone for however many frames behind a camera setup for a pretty big toy.
When I handled one, the shins also needed some plastic flexing to transform. I like how it hides the head and how the carrier mode has a cockpit but that's about it.