I'd agree that the turning point was OK Computer. While that record shows that the turning point wasn't as abrupt as it's often made out to be, OK Computer was

I'd agree that the turning point was OK Computer. While that record shows that the turning point wasn't as abrupt as it's often made out to be, OK Computer was the first time a lot of Radiohead listeners went 'huh?!' and either accepted or rejected this new direction. Kid A just affirmed this new direction as more than just some 'influence'.