Yes, there is that; but I am in no position to talk about it. I believe it allows you to run some Linux applications under Windows but I think it falls short of a "Linux experience". I could be wrong.
I have heard some bad things about it, and it could require some technical know-how to install and use.

Hehe. Yes, the Ubuntu flavors left me confused at first.
Here is my opinion on this matter: the graphical UI and "user experience" lead to immediate reactions. Things like updates, packages available, releases, philosophies, that only surfaces after some time of using. You get to evolve your opinion, your likes and dislikes, your "I can live with it" and "this is a deal breaker for me, what are my options?".

As for the desktop environments, they work best when you employ the entire "suit" of applications that were made to work with it. It is not mandatory, but they integrate better. "Why isn't my dark theme respected? Why do the icons look different and different fonts are used? Why does application A send deleted files to the trash bin, but application B just deletes them?"
Kubuntu is an non-official spin-off that targets the same inexperienced user base as Ubuntu, but pre-selects the default user applications. It runs from a live CD, so it could not be an install option.
This is my understanding.

I am with you on Flatpacks!

I know there was a limitation somewhere from Pro to a higher variant, that does need a reinstall.
But good to hear it is not the company LTS.

It's ultimately up to you, but being forced to upgrade Windows all the time is a con job.

Even though I have a Windows 11 laptop, I still mostly use Windows 7 for browsing the web, doing downloads etc.

The vulnerabilities they are always sprucing, are rarely a threat to the great majority of us, if ever, and Windows 10 is certainly good for quite a while yet ... probably 10 years at least.

Keep using Windows 10 while you can, and just be sensible about your web browsing and what you download.

Unfortunately too many devs jump on the bandwagon with MS, and stop supporting older versions of Windows with their programs and games, so you will eventually have to upgrade, unless you are savvy enough to use work-a-rounds.