Hmm
What I understand to have happened to the original timeline Operation Market Garden, when the Western Allies were already ashore and the Germans had already taken a beating in France - yet the Western Allies still encountered serious difficulty in forcing their way forward - leaves me sceptical that it would be a good idea for the Western Allies for them to attempt a June 1994 landing in Holland instead of in Normandy.
In addition to which, part of what assisted the Normandy breakout, as I understand things, was that Hitler was reluctant to allow troops to move from other areas to go to somewhere as remote from Berlin as Normandy, if there was a possible 'second' invasion closer to Germany to yet land, somewhere. If the Allies are landing in Holland, instead of Normandy, in June 1944, I'm not sure that Hitler's going to believe that a second landing could get plausibly come ashore anywhere closer, and the movement of troops to contain/destroy the Allied landings is going to be easy for him to authorise straight away.
You also knew that the entire operation was compromised because the allies had to take !!6!! bridges intact in 48/72 Hours to succesfully connect with Nijmegen?
Which in short means - 1 bridge gone and you've just chokepointed everything on wheels, which was also what was happened.
Also, Market Garden was VERY poorly planned aswell, ambitious yes, and if it was succesfull, the entire Ruhr area would be taken within a few weeks.
Although you DO have a point concerning shorter reinforcement paths, but if I would plan an invasion through Holland i'd make sure the the first 2 most west bridges connecting south (Moerdijk and Rotterdam, preferably also Gorinchem and Den Bosch) getting destroyed, and it wold take ANY southern German reinforcements at least 3 days longer to get there.