Except the whole point of these Collabs is if popular/recognizable things from outside TF transformed. What fan of BttF, Ghostbusters, DeLoreans, dinosaurs, fighter jets, etc, is going to want a shitty alt mode no matter how good the bot looks? The appeal is the alts this time. The bot modes are in service of that. They want to draw attention from people outside the TF fandom, and you do that woth really good alts.