Just chiming in here, to document another case of this annoying issue, which shows the seemingly ongoing decline of quality, in Apple products.
Got my 15" Mid 2017 2,9Ghz model (bought in december 2017) back today, after PAYING to have my screen replaced. Sent it for repair as it was exhibiting the stagelight effect, as well as blueish blodges in different areas of the screen. Other than this, there was a rattling sound from within the computer. It has never been dropped and the stagelight issue just "magically" appeared recently, when I started the computer up. The discolouration has been building for about half a year or so, but wasn't really properly noticed until a few months ago.
I had several frustrating discussions with Apple's tech support, to get them to accept that this was a known issue, directly related to the issue on 13" Macbook Pros of the same era, which they are repairing under an extended warranty on the screen.
Unfortunately there was no interest in accepting that the issue was anything else than normal wear and since I use this computer every day for work, I was forced to pay for the repair myself.
I have to say that this was the last straw for me. I am not going to buy a high end computer from Apple again, as I can no longer be certain that they produce products, that reflect the pricepoint of the device, from a quality-perspective.
I've bought Mac computers since 2005 and have had very good experiences with their service, when I've had issues, but my experience with this model (Aside from this issue, I've had the keyboard replaced in connection with the known issue there) and the level of service they are providing now just doesn't leave me comfortable with investing in their high end products.
As it happens however, I'm fortunate enough, to be in a situation now, where I don't need a high end portable device and it seems like Hackintoshing has become easier and more stable recently (Yes yes, the switch to ARM will probably mean losing the possibility to update to the latest OS'es in the future). So I'm going to sell this computer now, cut my losses and build a Hackintosh for pro media work. I'll get a entry level ARM-macbook, when they come out, for administrative work, seeing as I am not going to cross over from Mac to Windows.
Apple products have never been perfect, but the recent development for Apple in regards to quality and responsibility for that quality has been a sad development.