No, seriously, I immediately had to think back to my younger years, my VW Golf GTI also had a rear spoiler.
The rear window was always dirty, the air circulation, you know.
I fear that the UX will also suffer from this.
As already noted by @Ian Schmidt, Lexus and photos, that isn't usually a successful marriage.
But exceptions confirm the rule, don't they?
The very first photos of a car are very important (just google around now) and therefore more than successful with this ES.
Just judging by that picture...