Why doesn’t Fedora (Workstation) standardize the Qt theme with Libadwaita by default?
There are several options that allow you to do this and it would be useful to have the correct configuration by default. I wonder if maybe there are specific reasons why it’s not done.
I’d say there are two main issues:
First, there is no way to actually achieve visually consistency. Libadwaita and Qt apps traditionally have very different design languages. Libadwaita apps use more padding, larger fonts, etc. Qt apps may use menu bars and colored icons. You can make changes to make them look closer, such using the same fonts and colors, but it will never be perfect.
Second, making these changes makes it very difficult to not break the look of Qt apps. The only theme in which all Qt apps look good is Breeze, followed by Fusion. Also, Fedora used to ship a theme for Qt to make it look more like Adwaita and it was plagued by many similar issue. And even if the theme you make looks good now, it will need to be maintained as it will break over time. Sticking to Breeze and Fusion helps avoid this.
Ok, thanks for these clarifications.