I have to say, I agree with OP. I have a top-of-the-line Kindle since the 3G Keyboard. K Keyboard, Paperwhite 1, Voyage, and now Oasis. The lighting on my Oasis is uneven in brightness from left-to-right, has blooms at the individual LEDs, and is decidedly blue on the highest settings. I requested a replacement from Amazon when it was new, and got a replacement unit that had even more uneven light, and even worse bloom. I had to fight with customer support to get them to allow me to return the 2nd unit and keep the 1st.
For a nearly $300 eReader (no ads), the Oasis is extremely disappointing in the lighting department. Everything else with the hardware has been flawless.
However, Amazon brought me back to this forum, because of firmware problems causing missing or unrendered text.
link
All of which is to say, the Oasis is not perfect, which it should have been at the price point, and I am an extremely loyal Kindle user.
But idk if these issues are enough to make me ditch the hardware for an aurora...