I'm sure those writers were quite content writing for an actor of that calibre. Imagine putting words to the page, knowing Patrick Stewart will take them out into the world and surely stick the landing.
What a great combination.
We know Stewart was not a great writer, of course. When he had opportunities to take the reigns of the Picard character creativitely he usually asked for more action, and the results were a bit more conventional and boring. The combination was certainly also needed for the magic.
I always liked this video from an acting workshop where Suchet and Stewart deliver contrasting performances of Shylock and discuss their choices at length: