I first setup my laptop (a Fedora 2x) around 2015. After that date, I continue to upgrade it still without any issue.
Obviously I have some old directories and I suppose I don't need anymore.
So, can someone confirm to me if the ~/.kde directory is useless?

Of course I have a backup, but I would like find out if there are more directories that are not used anymore!

So, effectively, what I am looking for are the directories that are used from KDE Frameworks > 5.80

This entirely depends on the applications you use, ~/.kde certainly is not useless if you still have applications that are released less often. You can judge easily by checking the modified date of the folders.

I did, and 2018 is a bit old, isn't it?
I think I will get rid of it!

tpe wrote:I did, and 2018 is a bit old, isn't it?
I think I will get rid of it!

In any case, if any of the actual files in that directory were needed or used by something, they will be recreated, along with the folders, the next time those things are used.