KDE is still extremely anal about not touching anything remotely related to Microsoft, even if it's a properly licensed open source, is way better and even some GNU projects have no issue with it. Any reasonable suggestions to switch to vcpkg have been met with serious hostility, only because it's Microsoft's.
Had they used the more common, recognized tools and processes, they'd see more developer contributions, especially the one-offs, vastly speeding up bugfixing. Because nothing makes you want NOT to fix that annoying bug like spending 3-4 hours setting up your dev environment in the first place.
Oh, and do they have macOS runners available yet in their on-premises Gitlab instance?