This was not “kept missing” it was replaced by what the designers and developers believe to be a better approach - as this saves you having to switch out of normal selection mode and back again just to move clips.
This was well documented in the Manual and in the What’s New video - and the Release Note - so you shouldn’t have had to spend half a day … 
https://manual.audacityteam.org/man/audacity_tracks_and_clips.html#move
What you refer to as the “tine margin” is actually called in Audacity parlance a “Clip-handle” - it operates as a drag-bar.
Peter