Now this is by no means unique to Chromebooks, but my recent experience may explain why the repair pipeline may be clogged a bit.
I have a brand-new Chromebook which is still within the vendor return period.
I was having trouble with HDMI/sleep mode, so I contacted Google One Support. They don't really do much ChromeOS support, so after misdirecting me a couple times, they referred me to the manufacturer.
So I contacted the manufacturer, and with a little troubleshooting (and a bizarre keypress combo that the support rep would not explain to me, he said "just press it and it will resolve glitches") they determined that it must be a hardware issue and prompted me to begin the RMA process.
Now I was offended, because they didn't actually know what the issue was, they had just exhausted a few very simple troubleshooting steps with my cooperation, and they were out of ideas, so it must be defective hardware for RMA!
I have also run into similar support issues with my phone, where the first troubleshooting step is to factory reset. No effort at identifying the cause, just nuke the thing from orbit. (In that case, it was a very recent system update to blame, and of course there is no way to roll back system updates on non-rooted Android phones.)
But I digress. If I had sent my Chromebook back to the factory, they would've decided there is no hardware failure (I can do diagnostics just as well as they can) and it would go back on the shelf or back to me with no modifications. And then I would have lost time with my computer, the repair place would've wasted time with diagnostics, and my HDMI/sleep issue would still not be resolved.
I am contacting Support for issues that are not showstoppers. They are not preventing me from starting the computer or getting work done. It was just an annoyance that the computer stays awake. I found a workaround already. Just try not to do these silly RMAs, OK?