I totally get your feeling , I'm a ROG fan since 2006 and baught several laptops and peripherals and never experienced issues that wouldn't be solved by after sale service.
I purchased one ROG Claymore II and a ROG Strix TKL last year in may and June and for some reason this exact same issue happened as per your red one : https://rog.asus.com/forum/showthread.php?130894-ROG-Claymore-II-Certain-keys-not-working&p=875542#p...
Unfortunately , for some odd reasons, Asus product have only 1 year of warranty in the Philippines, where I work since last year, and this issue happenned 2 month after the end of the warranty.
If I would have purchased my keyboard in Switzerland, where I'm from and where I usually buy my product , I would have had two years of warranty, I'm really disapointed as, like you, I was not expecting this as ASUS ROG product allways have been of stunning quality and longevity, I'm still using a G752VS that performs quite well for his age.
If someone find a fix for this that would be awsome.
Best regards to all