It's now £500 for the base model and for what? A gimmicky inscreen fingerprint scanner, no headphone jack, and a still average camera. From a business POV I'm not sure how Oneplus see themselves anymore. They used to be the "compromise" smartphone where they'd cut out the gimmicky BS and deliver what matters for a genuine affordable price, but this just seems like they're forgetting what made them a great option. There's just no need for the 6t, and personally for that price, I think the Mi Mix 3 is much better.
Bigger battery and double the base storage - technically it's £30 less than the 128gb OP6.
That said, I've got an OP6 and see no reason to upgrade