@Gecko , if you remember I wrote about that exact same point, and how the 2 brands must live together, and how it was bad in the previous 2 decades to kill Toyota for Lexus
the solution was based on the TNGA
Which for which, and part from my humble solution is to make the GA-N profitable by turning the next generations NX & RX on it, and in the same time give the current NX & RX recipe to a brand new Toyota's
So then not only Toyota as a corp got 2 profitable architecture instead of 1, but also it will give the freedom to Toyota & Lexus as brands to up their games