Ha! I see that you updated your comment right after I read it and hit the "reply" button.
Yes, I was going to say that your statement isn't exactly accurate.
Foxlet, you know that I appreciate everything that you have done to help out everyone here. You have been very generous with your knowledge, skills and time.
However, it really needs to be made clear that even if one follows the instructions to the letter -- as I most certainly did -- things can still go wrong, both during the installation, as well as post installation, which are not due to user error at all.
For example, as you have now noted above, who could have foreseen that the VirtualBox kexts would cause a problem? That was not due to user error. It was due to Sierra running into something that it did not like. At least four people now have reported the very same camera issue, and I assume that there are others who are not even aware of this thread.
Sierra also broke another app which I use regularly -- and depend on --on a daily basis. So I think it would be more proper to say that even if done properly, Sierra may still have some issues, and it will break anything which stands in its path. Now that, in my view, is being realistic.
As I said, even if the end user does everything right and follows instructions to the letter, Sierra might still find something that it doesn't like -- a hardware or software configuration, for example -- during the installation process itself. There is simply no way to foresee this coming.
As I explained in detail in a private message to pkouame, my installation of 10.12.1 was going fine until the final eight remaining minutes. Then it ran into something which it apparently didn't like. I still have no idea what that was. But an hour later, it finally finished, and I ended up with a keyboard, Magic Mouse and wired mouse which would not work, so that I could not even log in, even though it was plain to see that the data was still on my hard drive. I later discovered that Sierra had also messed up my Mail mailboxes. Others reported the same thing in other threads I have read.
Again, this was not user error. This was ruthless Sierra pushing her weight around in order to make things the way she wanted them.
In conclusion, I stand by my statements. I think it is the responsible thing to do. People with older machines need to be made aware that if they are going to attempt to install Sierra on their machines, against Apple's own recommendations, it may go very well, it may go partially well, or it may bork their machine entirely.
I would rather be honest and clear about it, than paint a rosy picture for everyone. After all, they have a right to know what they are getting themselves into. They need to decide if the risk is worth taking.
Again, thanks for all that you have done. It has been a great help to many. But let's endeavor to present everyone with the full picture. 126 pages full of problems and challenges makes a loud statement in my book.