"Well-written communication" is slightly better idiomatic English than "good written communication", but the latter isn't incorrect. "Good" and "written" are both adjectives modifying "communication". The potential confusion with "well-written" (where "well" is an adverb modifying "written") makes "good" feel a little awkward, but it's valid.

That's hardly the worst thing about the sentence. "Today" is vacuous. "It's" is passive. "Almost" weakens "obvious", so we haven't even gotten to any actual information in the sentence and we're already quibbling. "Creates a business advantage" is awkward and vague. How does it create an advantage? What does this advantage accomplish?

All it means is "Good writing is important", and that is in fact so obvious that it doesn't need to be said. So skip it and move on to something the reader might actually want to know.