Well, DBus was politically pushed onto KDE back in the day, when there was a strong interest in making a success out of cooperation efforts in the Linux desktop space. IIRC, KDE was basically strong-armed out of DCOP.
Once it was established as "the official IPC on the two dominant Linux desktops", it would have been difficult to ignore it regardless of its actual quality.
Well, DBus was politically pushed onto KDE back in the day, when there was a strong interest in making a success out of cooperation efforts in the Linux desktop space. IIRC, KDE was basically strong-armed out of DCOP.
Once it was established as "the official IPC on the two dominant Linux desktops", it would have been difficult to ignore it regardless of its actual quality.