The post editor height is only suitable for creating small, simple posts - due to the fixed height of the editor window (400px). Trying to write anything substantial for patrons is quite difficult, coz you’re constantly scrolling up/down to review your work.
Suggestion: Make the post editor “max height” much larger or (ideally) auto-sized.
This was such an issue for me that I ended up creating my first Tamper/Greasemonkey script, to override the default CSS, and allow the editor window to auto-size, based on it’s contents.
(TBH, This is another one that surprised me hasn’t been fixed by now…)