

OK and? A difference of just 2 psi means that a bowl with diameter 4 in. (complete guess) is being held in place with ((4*π)=12.56*2)= 25 lbs of force distributed evenly across the surface of the plate.
A bigger bowl or greater suction changes these numbers dramatically. 2 psi on a 6 in. bowl is held in place with 37 lbs of force. 4 psi on a 6 in. bowl is held in place with 75 lbs of force.
Sure its “limited” in that there can only be a 14.7 pressure difference, but that doesn’t mean anything in terms of “this is really hard to undo”.
And if there’s oil or food or something sealing the gap between bowl and plate preventing the pressure from equalizing… fugheddaboudit.
I could change all the units to potatoes and wombats and my point would still be valid. You are being intentionally obtuse to avoid admitting you’re wrong.