I use Linux mostly. I'm aware that 7 is insecure, as is every version of Windows.

That's just a bunch of FUD to keep you on their leash. Security is always an excuse. If you don't do things like downloading and running random executables or letting every site you visit run JS by default, you've already reduced your attack surface to the point of being a non-issue unless you're being specifically targeted. In fact W11 probably has more insecure shit you didn't know about yet.

As much as I also use Linux and advocate its benefits, there's a huge amount of software that still doesn't work right there (even with WINE.)

Windows 7 Extended Security Updates were still there until January 2023, and if you know where to look, there's a guy, I believe he's Ukranian(1), who's been providing the ESU updates for mortals (non-corporate users). But yeah, "Download an EXE provided by a mysterious man to keep your OS 'secure'." isn't really a safe policy.

https://techcommunity.microsoft.com/t5/windows-it-pro-blog/u...

(1) The EXEs are signed with a digital signature where the signer's address is Kherson, Ukraine.

I've used 11. 7 is the last good version.