Grading is about versions not about how good it is
OS timeline
Win XP
Win 7
Win 8.1
Win 10
OS X
As main OS's
2001 - 2003 Win 98
2003 - 2009 Win xp
2009 - 2012 Win 7
2012 - 2013 Ubuntu
2013 - 2015 Linuxmint
2015 - 2018 Debian stable
>upgrade
>verb |ˈəpˌɡrād ˌəpˈɡrād | [ with obj. ]
>raise (something) to a higher standard, in particular improve
Switching from Windows 10 to 7 would be an improvement and therefore would be an upgrade.
1986-2003 MacOS
2003-2007 OS X
2007-2013 Arch Linux
2013- 2018 FreeBSD
KERNAL(Commodore 128)
Win 95
Win 98
Win XP
Win 7
Mint
ArchBang
Win 10/Manjaro
Crunchbang ++
Win 10/OpenBSD
Only cause you consider it as improvement does not mean you can call it upgrade (7 < 10)
The winshits in order up to 8, then mint, then ubuntu.
Started with a new Commodore 128.
Bounced between Sun, SGI, and HP PARISC systems in the 90s, now running Win 2016 / 10 and LFS (hardened or testing). Want to go back to Solaris on SPARC, but fuck Oracle.
It's by definition an upgrade.