Why is KDE so buggy for me compared to other DE?

OK, the customization is good. Most things can easily be customized; but I have a little problems.

Autostart conky -d starts multiple instances

This can be proved with pidof conky.

A quick fix for me is sh -c 'killall conky || true && conky -d'.

Dolphin search is broken in OpenSUSE Tumbleweed

Screenshot_20210701_205557.png

Generally I like Tumbleweed KDE, but why is this happening to me?