...I like looped BX (Romex makes me nervous as it is not used in most Chicago area installations: rats and squirrels eat them and turn them into incendiary devices!).Here's some pics to pick at. I drill tight between points, leave loops at boxes that might need to move or turn into quads, yada, yada, yada.
I have seen one hundred year old installations where the "in box" cloth and rubber conductors are completely frayed, but the electrician left a loop that when peeled away is virtually brand new and easily rewired to code and a safe installation.
My customers are happy to know that it is a reasonable repair instead of the dreaded "all must be replaced because it is 100 years old system".
City inspectors pass these jobs with no problem.