(speaking from industrial engineering experience)
Binding can occur when one side is lagging behind the other - missed steps etc - and puts a moment load on the linear bearings. The x axis is no longer level and pulls the vertical guides together, causing the jam. Unless the vertical chassis is visibly waving side to side in response to x axis movement, rigidity shouldn't be a major factor and you'd have bigger problems anyway.
Another case is when only one side is driven or both are driven from one source, connected with a belt and the belt/chassis is stretching, causing a lag and/or oscillations. As the Gmax has two screws with direct drive it shouldn't bind provided the steppers don't miss steps and both move in sync.
mechanically, binding is less likely as the bearing length becomes longer with respect to span.
Myself, I'm also waiting for my Gmax, selected it because it is one of the more soundly engineered for my purposes
, but fully plan to make a few changes to the design - moving to all metal e3d hotends is top of the list.
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