The issues that you mention are typical issues that occur with every release of a new OS. Programs that work on a previous version, but used unapproved ways of accessing the system, do tend to break on new versions. As for drivers, scanners in particular seem to cause problems - I lose count of the number of posts that I have seen on technical forums along the lines of "My XYZ scanner worked fine on XP but I can't get it to work on Vista", and so on. Don't blame the OS for poorly written software and lack of driver support from hardware manufacturers.
I can assure you that I use Windows 10 for rather more demanding applications than web browsing.
What you are forgetting is that Windows 10 was in public testing for a long time, so a lot of these problems should have been sorted before launch. I thought that that was the idea of the insider program.
I can understand Hardware not working between some versions of windows, ie, Windows XP and Vista as these versions used different drivers.
Windows 10 supposed to be able to use Windows 8.1 drivers and it does in some way. My scanner problem was that the software would not recognise a button being pressed on my scanner to scan. In fact the only software that worked in a fashion was the built in scanning software on Windows 10, but only as a flatbed, the single sheet feeder was ignored.
I did get it working after a lot of mucking around.
The sound card is another issue, I got it working with drivers supplied by Asus, but Windows 10 would try and replace the drivers with its own, which did not work. Why do that?
The unresponsive start menu, should have been fixed before launched, the context menus should have been sorted, little things like that.
I have rescued a few people who have tried to update to 10 because their machines have failed to update and they are dumped back to the updating screen all the time. What would those people have done if I was not here?
I think MS spent so much time in finding ways to spy on us that they have forgotten what a OS is for.
Desktop machine now powered by windows 8 pro 64bit, no dreaded metro and Linux , laptop by Linux