I don't see where you fetch your claims from. "hard real time operation", for instance, is the responsability of the operating system. If Forth is also the OS,

I don't see where you fetch your claims from. "hard real time operation", for instance, is the responsability of the operating system. If Forth is also the OS, nothing prevents anyone from implementing real time features like in any other operating systems. "Small teams" is common practice since Brooks, even in "big projects", where the workload is split among small internal teams. "Scale": that word means nothing without a dimension. Learning Forth takes a few days, but writing one rather takes a few weeks the first time, in particular if you want to go beyond the trivial "Forth in language X" stuff that doesn't learn you a lot about how KISS operates in Forth.