Not denying anyone else's issues. I've had nothing but smooth sailing. No issues what so ever.,
Same here. I have a mid-2012 Mac Mini; a mid-2012 13" non-retina MacBook Pro; a mid-2014 15" retina MacBook Pro; and a late-2015 27" iMac. I have not had a single problem with any of the four, all running High Sierra. I have had to update from Mavericks, to Yosemite, to El Capitan, to Sierra and then to High Sierra on the MacBook Pros; and from Sierra to High Sierra on the Mac Mini (new SSD) and the iMac and there was never a problem.
I am not boasting, so don't blast me for this. I just do not understand the sort of issues others are having. I may not be a power user (at best complex Word documents and design work with Pixelmator Pro), but it seems many of the problems users experience are not even related to high-demand situations. My four devices are in permanent use, but in different roles.
My reasoning is that since Apple controls the design of both the hardware and the software, then surely there should not be any problems, unlike with PC, where Microsoft has to contend with thousands of possible hardware problems that they cannot control.
Sometimes I wish I was on hand to assist fellow Apple users and help them to try and figure out strange issues. It's often better having someone look at the situation than to rely on feedback from a forum. I am not saying the support on the forum is not good, just that you may need a person to actually see your problem first hand from your perspective.