We had one machine here in the office spontaneously install Windows 10 and one of my co-workers machine at home installed Windows 10 without his input. Plus I've read dozens of internet postings of people complaining that Win10 installed without asking so I'm not sure what you mean by "hav[ing] Windows update set correctly".
Again, the internet is full of people claiming their machines are overheating after the Windows 10 upgrade. Probably a matter of new Windows 10 drivers not working well with older hardware. I'm sure they just "set something up wrong" but hey it's not Microsoft's responsibility to pay for all the wasted man hours, lost data and damaged hardware they're causing.
I'm glad you've not had any issues with Windows 10, but do you run any old software or control any old hardware? I'm sure it works fine for people that do nothing but email, surf and MS Office, but its breaking computers that people use to feed their families all over the world, so I"ll stick with the "FU MS" crowd.
I swear I'd gladly give Adobe one of my testicles if they would just churn out a Linux version of Creative Cloud so I could dump both Microsoft and Apple (who are no better than MS).