I appreciate the polite dialogue.
When I have made my comments I have tried to be careful not to dismiss those who have problems, as that is not my intention and I do not think people are just making things up. But I do think the vast majority of these problems can be handled with some basic troubleshooting steps to figure out what is wrong rather than just revert to "El Capitan is awful."
I suspect Apple's implementation of system integrity protection (SIP) caused more software conflicts than previous OS X updates did and that contributes to the problem. I had to disable the utility Bartender for a few days until the dev. did a SIP compatible update for example.
******
I never implied that you take other people's problems in a light way.
I know you respect them.
However I am sorry to repeat myself telling things I already post.
I find
ridiculous, for instance, what I had to do (after a
clean install of El Capitan, since an upgrade did not let me shut down my nMP) just to install Windows 10 in my Mac, after many failures to do it through the BootCamp I got with El Capitan, which stopped every Windows installation because the
existing and already NTFS formated partition was not recognized:

1) make an external clone drive of El Capitan
2) erase El Capitan from my inner drive
3) reinstall Yosemite
temporarily into it with the Installer I had kept
4) install through
that working BootCamp Windows 8.1 and update it to Windows 10
5) boot from the external El Capitan drive
6) erase the Yosemite in my inner drive
7) clone back El Capitan into it
8) check it with DiskWarrior (just to be sure the system was still OK)
I did not get any feed back when I asked if other people were having the same BootCamp problems I had.
However I cannot see any logical reason why it didn't work directly from El Capitan
in my system, and I do not see any relationship to the SIP feature which you believe might be behind most problems, but I am no expert, I agree and respect your knowkedge.
However if I had to disable SIP to succeed from the beginning, then my repeatedly failing original BootCamp should have warned me to do that.
I suppose that looking for help from
Apple to install
Windows
or from
Microsoft to use
BootCamp
would have brought not much...if anything at all.

So I was left on my own...and the only thing I could find was that akward round-the-block procedure

which led me to my goal...but
certainly not in the direct and easy way it should have been, if El Capitan and all its
included utilities actually worked as they should work.

Ed