In the wake of adwaita-qt's discontinuation, I embarked on a search for alternatives and stumbled upon KvLibadwaita, which has done a stellar job in crafting a Kvantum theme that mirrors the Adwaita theme's aesthetic for Qt applications.
Building upon KvLibadwaita, I've made several modifications and rebranded it as BigAdwaitaRound.
However, the quest didn't stop there. To align the window border theme, or the Kwin theme, with the Adwaita ambiance, I utilized the versatile and configurable klassy and shared a preset that convincingly emulates the Adwaita theme.
The Plasma theme was the final piece of the puzzle. Drawing inspiration from how KvLibadwaita is a modification of the Colloid theme for Kvantum, I tweaked the Colloid Plasma theme. The modifications were minimal yet impactful, bringing it into closer harmony with Adwaita's look and feel. I also dialed down the transparency, opting for a non-blur theme approach to enhance performance.
For those interested in the complete Colloid theme for KDE Plasma, head over to Colloid-kde.
This suite aims to provide a cohesive and performance-friendly Adwaita experience across Qt and KDE Plasma environments.