(This is a half-rant half actual question)
I wanted a nice qt theme to use on Scribus since Arc Dark doesn't work on there. When I tried to install it, pacman said this will install 50 packages. 300 Mb in total.
Why does a theme need packages such as Kauth and Kwallet?
Breeze is artwork, styles and assets for the Plasma desktop. I have seen this happen with other distributions as well. I couldn't tell you why it needs all of those extra bits and pieces.