I was thinking under the cross-platform desktop+mobile league sorry! Obviously when you develop with OS-specific and with a form factor even an SDK so neglected as any linux GUI will be a lot more simpler, and if you face complexity there, it's an issue and not a natural consequence. Furthermore, the classic complex JS front-end excuse is that forbes500 firms, for whom React and Angular have been made, face problems with access and speed in rolling features that probably only MMO games face, which for most of their history have been developed under Windows only.