Re: Going back to square 1?
Other OSes are freely (or very costly) available, some of which slurp less, some slurp more. Some look like various versions of Windows from 3.1 to Windows 7. Some will even make a stab at looking like DOS if you want to go that far.
Take your pick, I am sure you can find one that fufils your needs. You could even install a copy of Windows 7.
If you really hate windows 10 make the break to something else. No one is forcing you to stay.