I wonder the sweet point between BP and C++. One of my friends is making a commercial indie game in UE and he is doing everything in BP because he is an artist, so C++ is particularly daunting for him. He did complain about the spaghettis hell he eventually came upon, without anyway to solve it, but from the number of wishlistings (targeting 10K), I'd say it is probably going to be a successful game, judging by first indie game standard.