IMHO Forth has a longer learning curve than other languages and requires a significant mental model shift if you are use to conventional languages. It does not suit everyone. It seems more like learning a new human language with a large number of words.

Chuck Moore created Forth to improves his productivity versus conventional tools and there is some anecdotal evidence that it worked for him and those that worked with him, particularly where direct hardware control on new hardware could be interrogated and validated via the interpreter rather than an Edit/Assemble/Link/Test loop.