"I wonder if it's time to give 6.1.5 a spin."
Seems OK. The bundled icons seem to be the extremes of line drawings my granddaughter would have discarded when she was 7 and the slightly garish. Fortunately the Oxygen add-on still works. I don't know why, under Linux, they can't just use the current icon set from the OS.
I wonder how long it will take 6.2 to settle down. The prospect of being able to use KDE file dialogs on KDE is appealing.