nprofile1qy2hwumn8ghj7un9d3shjtnddaehgu3wwp6kyqpq88q3683vez7v4mnugjv4nf6ud3z9mkn2h7kgc76z6ph6advw5vdq3nq3m3 (nprofile…q3m3) on the note of ricing the desktop.
I think the biggest factor is... Ricing is just hard right now.
Starting with KDE - the absolute mess of Plasma theming (as nprofile1qy2hwumn8ghj7un9d3shjtnddaehgu3wwp6kyqpqqhpk2z0n4la7vrr36dh3xp6nv9gu3c2c6lm4txk0ft0gtdl8m80qh8649m (nprofile…649m) described in his video) often makes ricing it just look incoherent and broken in many ways, and Breeze is servicable enough for most.
As for GNOME - they are just doing absolutely everything in their power to make theming GNOME extremally hard if not impossible, and default on Ubuntu is also servicable.