From some of the problems that I read here on the forums, High Sierra reminds me when I updated my MBP to Mavericks and it bricked my computer with kernel panics, restarts, and freezes. I took my computer into the Apple Store and the Genius ran a few tests and indicated that my MotherBoard was dying and should be replaced. Fortunately, Apple was still supporting my model year. I had my my MotherBoard replaced for a reasonable fee, but I specified that it should be seeded with Snow Leopard; not Maveticks. For me, El Capitan is like Snow Leopard; smooth and trouble free.
I hear you loud and clear. I didn't upgrade even to Sierra and was super happy with El Capitan until it was absolutely necessary. The only reason I had to go to Sierra (and briefly to High Sierra) was because of my latest Mac's original OS being Sierra.
OS X 10.11.6 was rock solid for years and years, with tons of software added and also removed and never a clean re-install, and even after switching Macs.
Even at 10.12.6, Sierra is no El Cap, but at least it's not like Release Candidate 10.13.3 masquerading as legitimate OS code.