If you use Qt apps, it will use KDE's keyring. This is simply caused by the lack of standardisation in such elements of Linux desktop environments.

I tend to use mostly Qt apps, because they look the most 'native' on KDE and have the best integration. They also have the same philosophy (the more user choice and settings the better) which I subscribe to, so I naturally gravitate towards them.

And no the wifi applet always worked correctly for me (I don't use wifi on my main desktop but on laptops it works fine for me)

There's also things I don't like with KDE but there's almost always an option to change it. Whereas with Gnome there is almost never any such option, it could be there is an extension that does it but having too many extensions tends to drag you into a quagmire of version dependencies making it really hard to upgrade.

The one thing I really don't like about KWin is that the virtual desktops of each display can't be switched independently like with i3 for example. They're all stuck together. But this is a minor inconvenience compared to all the things I dislike about Gnome.

Of course YMMV and that is why we have Linux <3

I think both Gnome and KDE are pretty good but Gnome's design decisions and philosophy don't match my preferences.