generally speaking - typically but not always

when a fit / set-up / whatever looks odd - very different - it can be cause for question if not concern

seat slammed way back or forward ... excessive seat angle ; seat pointing up to the sky / seat pointing down ... goofy looking seats ... no seatpost showing - or too much showing ... excessive stem riser height - or excessive drop ...

a zero length stem possibly fits into this category

but who knows maybe this will be a trend in the future