Here's an article with more details on the move. On the whole, it seems to be a mutual agreement:
Quote:
“But as the show has evolved and become more ambitious production-wise, I determined that I would not be able to deliver episodes until 2020, which would be challenging for the network. So, we began to discuss how best to support the third season in a way that worked for the show. It’s exactly this kind of willingness to accommodate a show’s creative needs that’s made me want to stick around for so long.”
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https://tvbythenumbers.zap2it.com/mo...-third-season/