Get your point. Apart from (my opinion) like and karma doing much the same job in practice, there's another side to it, in the future forum software (still in beta, no absolute date yet) karma is removed, the developpers have decided it's only 'like' that will prevail.
Some more changes are in the pipeline, hopefully for the good, like much better attachment handling (pictures anywhere within posts\text, not only at the bottom like now).