To be fair, no matter the OS updating on the latest and greatest immediately after release is always risky and should not be done unless you have clean backups and are ready to reinstall it all if needed. Linux testing, iOS, OSX, Windows 10, ... All of them.

If you want stability and safe update, you either use safe release version (Debian stable, Win10 LTSB, ...); you wait the service pack, or you give it a month or two to have issues found.

Yeah I'm fine with the decision I chose to make. Having a better built in snipping tool was worth it!

Is win10 LTSB available to anyone who wants on win10 home/pro?

I don't think so, you need some corporate contract or the like.

JFYI, accordingly to this, LTSB is now LTSC and you shouldn't choose it unless you have an embedded device:

https://blogs.technet.microsoft.com/ukplatforms/2018/06/11/s...

Of the twelve key points/reasons given in the above, more than six make me actually want to have a LTSC, however.

Unfortunately that's no longer how Windows works. I'm in the One Plus beta. If something breaks its my own fault. I was warned. Windows pushes updates to EVERYONE and you can't opt out.

You can, if you disable Windows Update from MMC service panel, it will not try to re-enable itself, but that's that. It is either all or none. No intermediate settings.

Can you tell us which hive&key it is?

You can follow this guide:

https://support.microsoft.com/en-gb/help/940017/user-profile...

You access it through the group policy editor (covered in the above article).

I guess this was a problem once with Vista 10 years ago. The same exact steps work with Windows 10.

Windows 10 should be considered an eternal beta according to your post.