Yes I have a couple of months ago and my complain was that Native Instruments Kontakt 6 scaled ugly small on my 4K monitor with Cubase HiDPI.
The answer from Steinberg was that the problem was caused by Native Instruments Kontakt and I should contact them to solve the problem.
I did contact Native Instruments but NEVER got an answer from them!
I understand FishCorp’s frustration, because now I’m also forced to work without HiDPI in Cubase 10.5.12 with blurred fonts.
Now, that is a customer friendly option, isn’t it?