It is just like when a video game team decide to switch or rewrite the game-engine mid-course. A huge red flag. Almost always kills the project or make it so late that it becomes irrelevant.

C++ is not a perfect language, but it works, and they have experts on the team, what they are trying to achieve is difficult enough.

Well, RIP Ladybird, I was hopeful about this project, this seriously makes me sad.