I wasn't comparing pros and cons of shorter/longer stems on handling. The point I was trying to make was, from longer to shorter stem the handling could be a lot "different". I've changed saddle to handle bar drop, saddle, saddle height, seat post, wheels on the same bike....Based on my own experience, nothing affected handling as much as switching from 110 to 80 mm stem.

Very interesting article:
How does stem length affect a bike?s steering and handling? | CyclingTips