All cars are basically the same: Mostly they have four wheels, an engine, a steering wheel, brakes, etc. However no one would argue, rationally, that all automotive companies should merge. The diversity of needs and desires of the market supports different approaches to the same problem.
The crypto space needs to be the same to avoid dieing to group think. While I don't support the open hostility common between competing crypto technologies the competition for market share is good for everyone.