Part of the problem is that they are combining US and British (bbc) tv production schemes. The US focuses on market data, the box ticking. But this requires ongoing feedback during production. That's why US pilots are so different than the eventual series. The bbc selects a show for production run without data or pilots. They rely on expert opinion to greenlight a far shorter initial run. If a show is a miss it disappears after six episodes. Netflix is doing both, resulting in shows that lack market feedback during a long season (iron fist) yet also seem to be boxticking (stranger things). This is a tricky path and while sometimes it works (stranger things) often it doesnt (ASOUE).