One thing that must be stressed. Digital information in notational form when played back, regardless of how sophisticated it is technically, doesn't replace the sound generated by an actual musical instrument.

You can use the "electronics" as an instrument in combination with real musical instruments however the caveat is, how do you make music with it that doesn't sound robotic?

As to the controversy, I have found Sibelius to be quite logical and can generate a lead sheet quickly. I miss the playback features of Encore but the graphics, the presentational clarity, the versatility to adapt to Logic Pro, the organic using which becomes a part of you, and the templates for scoring work for me over the clunky having to do numerous steps of Finale.

A lot of course, depends on the application but for a composer, the most important thing is to get the ideas in notation down quickly and as accurately as what you hear in your head. In this, Sibelius, for me, wins every time.