High Sierra was lots of new changes under tho hood whereas Snow Leopard was lots of improvements to existing stuff. High Sierra switches solid state drives to

High Sierra was lots of new changes under tho hood whereas Snow Leopard was lots of improvements to existing stuff. High Sierra switches solid state drives to the new APFS file system and the WindowServer is now rewritten to use Metal2. So I would suggest that High Sierra is far from a stability release like Snow Leopard was. It was about ripping out the foundations and building new ones. The APFS transition, to Apple’s credit has been mostly painless while the WindowServer changes has been hit miss depending on your hardware. These were things Apple had to do and they benefit all their platforms.