I suspect overlooked and stalled pull requests are common in open-source. A small one of mine (to a popular project that is not KDE or GNOME) recently took half a year, and most of that time was spent waiting for reviewers and bikeshedding the docs. My condolences on the frustration.

For what it's worth, I'm not part of KDE's inner circle, yet the several PRs that I have submitted to them since I started using it (~2 years ago) have all been accepted. One was difficult to shepherd through the gauntlet of opinions, but was finally merged. So the process is not entirely impenetrable.