Z390 Issues

Hey!
Just now watched the video from Hardware unboxed on YT, titled “Oct 2018 Q&A [Part 1] How to Fix Z390 Mess? Can AMD Compete With 2080 Ti?”

Can someone or maybe multiple people fill me and everyone else in by explaining - what is this Z390 mess he speaks of ?

From the video, I wasn’t able to absorb the essence.
Thank You! Hope you are having a nice day!

Many of the lower-end z390 boards don’t have strong enough VRMs to be able to safely run the 8-core parts at full potential, even as they run “within spec” while doing so.