When many gnome developers released this blog post, a whole lot of people freaked out. Attacking the developers, claiming that they were anti-features and trying to limit user freedom. However, I believe that not only are the writers of this blog post completely in the right. I am going to explain why I agree with them when it comes to theming apps.
However, GTK developers are working on a way of allowing distros to specify color schemes, so they can make apps look more consistent with the look and feel of the distro without needing to change the stylesheet. Apps will always use Adwaita, but you can optionally support color themes using a special API.
One of developers said
spoiler
don’t hold your breath on that
.