Offering as an additional data point...I've had my 2018 MBP 15'' (base model, running High Sierra, purchased from B&H during their sale) for almost a month, and have had zero issues with it.
I run it mostly in clamshell, hooked up to my HDMI monitor, audio interface, midi keyboard, etc. through a hub, but take it off occasionally. No KPs, no reboots. Crossing my fingers this continues, and definitely not messing with it by trying to upgrade to Mojave.
I run it mostly in clamshell, hooked up to my HDMI monitor, audio interface, midi keyboard, etc. through a hub, but take it off occasionally. No KPs, no reboots. Crossing my fingers this continues, and definitely not messing with it by trying to upgrade to Mojave.