Right. Companies need to figure out what they are going to be good at and what you buy from someone else. There is no one correct answer, and often the best answer changes over time (both reasons that different companies will have different answers). My company architects have been debating what IPC framework we should adopt for longer than it would take me to just write one from scratch - but they are correct to debate this instead of writing one because adopting means we don't have to maintain it and eventually that should cost more than all the debate. (note I didn't say will, though I think it is likely)