That is not a modern Corolla iM. The iM had about 130hp. The GR has 300. The iM had comfortable, "sensible Corolla" suspension. The GR has race suspension.

This is not a "basically stock" corolla. It's actually a really cool car with a fun story behind its design. Toyota's then-CEO Akio Toyoda is a big car nerd and an accomplished race car driver. The GR Corolla was his dream car. He was directly involved in the design and development of the car, and personally took the prototypes to the track for test drives to provide feedback to the engineering team.

It's ok that this is not your thing, but please do not be condescending towards other people's hobbies.