Sgt.Schnitzel wrote:But isn't that the whole point of this topic?

I thought TF's took earth modes to blend in the environment?
Did I misinterpret that?
Not always:
Protection from Energon radiation - Beast Wars, Spotlight Shockwave
Want of a powerful alt modes - Dinobots
Some modes give way to new abilities/weapons - Depth Charge - let's him go underwater, Movie Brawl - gets a huge new arsenal of weapons to play with, Jetformers can fly
Allows for faster travel - Cars, Jets, Cheetahs, etc
Sometimes they're made alt mode first - Animated Dinobots, Despensor, Xbot360
Sometimes they evolve into them - Beast Machines, Animated Soundwave, Beastformers in TF:Cybertron (?)
Staying in alt mode allows for internal repairs - Beast Wars
And in the odd rare case, an alt mode allows for "autopilot" and/or eating - Unicron
And lets face it, sometimes alt modes are just more fun - Beast Wars' King Kong vs Godzilla references, Fuzors, Waspinator, Starscreams F-22 chase in the movie, and actually transforming a figure.
Alt modes; not just robots in disguise!