Just random thoughts on how a bot picks his alt mode. I think that while a transformer may scan a car and have an alt mode just like it, it's not the same. To me it's the shell that matches the car but the stuff that's under the shell is completely different. An Autobot has no engine, no gas tank, no mp3/cd player or built in dvd player nor do they have fully adjustable seats, seat belts and no cup holders. I feel they only imitate a vehicles shell and nothing more, they do this in order to blend in not get faster or anything. If they want to get faster they can upgrade components, wear lighter armor plating etc. A big bot would have to choose a big alt mode to not look conspicuous. Also I feel the reason more bots don't pick jet modes is because they lack the necessary propulsion systems needed for take off, in other words if a bot is equipped with the gear to make tires spin he sure isn't gonna be able to take off with a jet mode unless he installs a propulsion system in place of the system used to spin the wheels. A bot with a propulsion system wouldnt be able to use a wheeled mode. Same applies to those with chopper modes etc. I also think that a bot could not run around unarmed, scan a tank and transform and start firing off shells. He'd have to have a weapons system installed such as an ion cannon or beam cannon etc. To me this makes a lot of sense as to why some bots have cannons present in their bot mode. I think a bot without a integrated heavy weapons system who scanned a tank as an alt mode would look like a tank with a sawed off barrel. Triple Changers have a wider variety of alt modes to choose from as they use a different set up. Thought they a variable transformation system they also have weaknesses due to this system being installed, such as burning through energy quicker and reduced attributes for each mode such as a triple changer who turned into a jet would not be able to keep the same pace as a regular transformer with only a jet alt mode. These sacrifices are to make them more versatile on and off the battlefield as they can fit a wider scope of roles. Beast Modes are best for places with hostile environments where vehicles would not cut it, which is why the Dinobots took dino modes when they landed on earth millions of years ago. Beast modes use a processing chip to help a bot control any limbs they didnt have before as well as imitate instincts and animal behavior to help a beast bot better navigate their body and utilize it properly. This system sometimes clashes with their personality chips which is why some beast bots prefer to stay in beast mode. These are my thoughts on alt modes more to come later.