Even if 1809 is finally to the point it contains no major issues, it's still a rather unnecessary nuisance to have to go through and verify which drivers are in use and make sure previous settings are put back in place. Nothing like having Windows reinstall all of the hardware under device manager every six months. This may not be an issue for folks with the most common hardware, as they won't even realize this is happening, but having to redo driver configurations just "because" is counter productive. Even if all of the same drivers get put back, you are increasing the possibility of machine downtime and decreased productivity.
Might as well be driving down the road and at some random time, twice every year, have the government forcibly mandate that you pull over to the side of the road, take all of your tires off, then put them back on.
I didn't buy a computer so I could follow Microsoft around and clean up after their OS, and I don't like having to wander through their terrible new settings UI after major updates trying to figure out which settings have been reset to Microsoft's preferred default again.
Can anybody even name off the top of their head, a major new feature that Windows 10 1809 brings to the table that might get regular use, without resorting to a Google search? I don't count DXR as that isn't an update to the OS, and it shouldn't require reinstalling Windows, that's just an extension of the existing DX12 API.