I love how they create video games and movies with the toys in mind.
A majority of that stuff Hasbro can create with minimal investment.
The TIE crawler, Rancor, Snowspeeder, Hoth Turret - the list can go on.
Maybe it's because they're too lazy to delve into the immense corpus of comic and RPG material to find "new" designs.

But frankly I think the main reason is that the game creators are deathly afraid of scaring away the casual fan if they deviate too far from "familiar" movie material. Witness how seemingly half the games are X-wing/snowspeeder piloting simulators set during the Holy Trilogy, and how every ******* game has to visit Hoth and Tatooine regardless of story logic or continuity.
And to a degree I have to admit they're right. Which more loudly broadcasts "STAR WARS!" to Joe or Jane Shmo walking into GameStop: a TIE fighter with tank treads on it

or that robo guard dog thing posted above? I think we all know the answer.
This is true to a certain extent in some comics and RPG guides, but it's much more noticeable in the video games because they have to attract "normal" consumers ... while the only ones of us who read the comics and RPGs are already nerds and we're much less likely to be scared away by *gasp* new material.