It’s possible you have a small sample.. I have not noticed “total domination” myself. The type foundries I know and sometimes work with are split. Many use RoboFont. FontLab is less common, but there are some shops that have invested in it deeply enough they’re still using older versions, even. And others develop their own tools, like Fontra, to better address challenges in CJK type design

RoboFont is deeply tied to the Type & Media program at KABK in the Hague. And it has a long history, building off what came before - it is both font software and pedagogy. My memory on this isn’t perfect but I believe Glyphs and RoboFont were both proposals around the time the UFO spec was being formalized