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Replace ember-cli-sass with postcss #108
In theory, both processors should yield pretty much the same output.
Regarding maintenance cost one could argue that you now have to keep track of
This "could-be disadvantage" is also one of the big selling points. You're not buying in to a monolithic system controlled by an external power. Instead you include just the parts you really need and could even write your own plugins rather simply—something that's not possible with Sass.
Obviously I'm trying to sway you over here, but in all honesty, I haven't experienced any down sides so far.