I've seen this odd blue/purple hued keyboard thing in person, and it really is an eyesore thanks to the not so vibrant Touch Bar, which also gets warmer when TrueTone is activated. But even without TrueTone, the color temperature mismatch on the keyboard against the touch bar is just unacceptable. And, the contrast between the two exacerbates the overly blue/purple hue of the keyboard, and the already dull Touch Bar. When they are closer in color temperature, the eye just glosses over any small variances.
When I first heard about this I thought it was only due to TrueTone changing the Touch Bar's overall tone, or due to the contrast of the green tinted factory display panel as mentioned in another thread, but no, there are some odd looking keyboard backlights out there. Some have a yellowish tone, and most are where they should be, in that bright white middle ground.
No one is faulting Apple for using multiple component sources, it's the smart thing to do, especially when ordering parts in high volume as Apple does. The issue is that in some cases, the variations between units are glaring, and seem unacceptable for some customers who pay upwards of $3500 for a premium product.
Apple needs to take their obsession with detail and use it to crack down on their suppliers to try and narrow these variances down a bit. You'd think that their extreme attention to detail would prevent these mismatched components from going into production, but perhaps they needed all parts on hand, regardless of them being a bit off spec to start shipping this highly anticipated new product. I am sure Apple has ordered these with a backlight color temperature spec, there isn't just one white tone LED.
Small variances are acceptable, and to be expected. But having a blue hued keyboard backlight paired with a white or yellow-ish white touch bar, on one of the most expensive laptops ever made, well, that's just unacceptable. Apple customers expect top notch quality as that is what they are paying for.
If these blatantly obvious component supplier variations don't bother you, then other people voicing their concerns over their new MacBook Pro's shouldn't bother you either, so they shouldn't be judged for expressing them.