This is because Target seriously has always underestimated the amount of hours it takes to fill the floor. Their processes themselves are more inefficient than they realize and most successful truck teams had 35 or more TMs on a truck for 4 hours a piece, and it was understood that they would stay late on trucks to finish (effectively adding hours).
The problem with E2E is it divides up the hours but the overall time it takes to work a truck remains the same. One or all areas do not receive what it takes and struggles. You either (for example) schedule what it actually takes to work Softlines and short Flow too much, or vice versa. This is because it was assumed that the 4-5 4am to 8am Flow shifts would all stay to get Softlines done no matter what before, and now that we schedule 2 6-230s we are confused