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The open frame is weaker for the same reason a single bolt lug is weaker in center fire rifles, Single sided off set support does not handle pressure as well as opposite two side support with less steel ( arbor with a wedge slot cut in the middle of it) to withstand the thrust pressure. The steel left on either side of the wedge slot in the arbor is far less than is the combined mass of the top strap and lower frame along with it being off set to the thrust vector pressure line.So.......
I am still waiting to see the open top even "beefed up" that handles magnum loads from Casull or Linebaugh, until then.....
Think Krag (one lock lug to the rear) as opposed to Springfield ( two lock lugs on opposite sides to the front) bolt guns.
Front lug lock up handles pressure better and flexes the action less than does rear lug lock up support.
The same is true of closed frame design in revolvers.
There is not one magnum level revolver I'm aware of that uses an open frame design and the reason is thrust pressure management.