
I gotta be honest, unless one is working at a certain level where they need to do a bunch of conversions to various formats and color spaces, I don't think ACES is needed. I recently spoke to a senior colorist at a very high-end post house here in L.A. who confessed that he never uses ACES on any of the many TV shows that he works on.
I do think colorists who work on projects that utilize a lot of VFX also probably find ACES a useful tool for round-tripping with all of the various VFX studios.