I'm happy to see it's finally happening, and I hope they left its implementation flexible.
What I'd really love to see (aside from triple buffer) is a real solution to the system tray situation. AppIndicator is problematic for some apps and under certain X11/Wayland desktops, and even when it works well it is cumbersome to use compared to traditional tray implementations. Hoping we see a new approach soon.
In the meantime, I've been enjoying a revisit to KDE Plasma under Kinoite and I have to say I'm really impressed with both DEs!
And I don't even care if they keep it as a "tray". I'd be content with integration into the dash if they can make it work smoothly. For example, just having the app start minimized as a regular icon (or segregated icon) in the dash...just something at this point.
I think it's based on the xdg-desktop-portal accent color support, but there were specific hooks added to libadwaita to handle that desktop standard, at least that's my guess based on this.
Definitely glad we have the major desktops all natively supporting accent colors now, it's been a long time coming.
Simple, they've been working with goals of each release, so most of the things that clearly aren't going to make it to the next release don't get top priority compared to the things that will. It also just so happened that a ton of these year-spanding works have finally being considered done today lol