Currently the scale slider extends the script from the middle (pos 50). Since most L0 scripts are based around the bottom (pos0), it doesn’t work that well for the axis. See this post by Yoooi.
As for the topic I felt like there’s a lot to be researched and debated. Personally I felt like the specific device used would affect a lot of these decisions. There are devices that are a lot less accurate about vertical positions, hence scripts produced for them are also more fuzzy about it (cough A10 cough).
In the end I don’t think how to script is something that should be engraved down like Code de Hammurabi (I’ve done something similar in the past and have dialed down my tone a lot). Hence the staff notice.