I use Windows 98, first edition, with all the patches.
I have not upgraded for several reasons. The main one being...
If it ain't broke, don't fix it!
When I complained that my HP scanjet and PhotoDelux 2.0 is not being recognized by the harddrive, his response was, "...scanners only cost a little of $100 these days....."
I like your commandment better. If it ain't broke, don't fix it. Should have let it alone.