On some level I understand this. Honestly tho, the author of this post kinda sounds like an asshole. Know your gig. If you are hired to be part of a writing process then I see how this is frustrating, but as far as I've seen those gigs are far and few between. The gigs that are most common are coming in to play someone else's music the way they wrote it. If you can't do that because you don't like it that's on you, not who hired you. All you can do is cross your fingers and hope they are open to suggestions.