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It was commonplace at the time to try to replicate the arcade, but i don't think everybody had the same focus. The 2600 was a machine with many original titles that didn't resemble typical arcade games, created by Atari and its third parties with the home experience in mind (something its rival consoles usually missed). By that time the arcade game scene was huge, so it was great to be able to play them at home, but the 2600 proved successful and remarkable with its original games and in the end helped to establish game consoles as something of its own, not just something meant to try to recreate the arcade.
And answering the thread's title question, i think that's why the Colecovision doesn't got more historic recognition. It's library didn't offer something new or different, essentially made of arcade ports that, though competent, weren't as good as the originals.