Uh certainly, FP language are certainly the most powerful and flexible languages, aside from maybe logic languages, far beyond OO. FP language definitely encompass more, you are correct there.
I just think it's important to not to confuse power and flexible with usefulness. Rigidity and limits have their uses.
As far as c++ goes, it's market share shrinks every year yet since the market grows and c++'s share began huge, c++ gains more users and more market position every years than the total users of functional programming languages. That may change in the future. FP will have to show its usefulness and not only its power and flexibility for this to happen.
I just think it's important to not to confuse power and flexible with usefulness. Rigidity and limits have their uses.
As far as c++ goes, it's market share shrinks every year yet since the market grows and c++'s share began huge, c++ gains more users and more market position every years than the total users of functional programming languages. That may change in the future. FP will have to show its usefulness and not only its power and flexibility for this to happen.