Desktop notifications on Windows have always been dogshit (why do I need to manually dismiss them after handing whatever triggered the notification?), but incredibly Microsoft have managed to make them even worse. Just recently Windows has started regurgitating notifications which were triggered and dismissed several hours ago.
The general decline in quality started long before the AI fad, but while Microsoft have never been able to design anything that was not annoying, things generally worked, and I've never heard a good explanation for what changed. The company has been MBA-driven for god knows how long, so that's not the reason, at least by itself. Have all of the "old guard" left or been marginalized out?