Arguably WYSIWYG engraving software only exists to provide a workable user experience (vs editing lilypond or god forbid musicxml notation in a text editor). Having worked a fair bit on it and as a regular user of it I'm only too aware of areas still in desperate need of a better UI/UX though. Still hope to go back to contributing more regularly at some point, though I didn't especially enjoy having to regularly deal with the foibles of a large complex C++ code base and digging into the internals of Qt to figure out weird UI bugs.