I always felt that a ship's warp field was much closer to the outline of a ship's hull. The original TNG warp effect (and maybe even earlier warp effects such as those in TMP) could be looked at as afterimages, IMO. The ship is already long gone, but there's a brief lag before the light from it catches up, at least to an outside observer.
Not a big fan of the current warp jumps seen in recent Trek productions. Too generic and indistinguishable from the lightspeed jumps in Star Wars, IMO. The less said about the Discovery's spore drive effect the better. I would have had the ship just disappear and then reappear in a blaze of light rather than all that spinning around.
So uncivilized...