Obviously the load changes, per terrain. I can't say why the smaller D4 tractors did not retain that design, I've run several of both types. I do believe that depending on the use, type of work, terrain, the sprocket can take/transfer an increasingly heavier load, more impact and shock loads, one can only speculate as to what high use, high hour heavy mining and industrial applications does to shorten service life of the old design, compared to the newer designs. I do know what a a job it is to take one of these down to the bevel gear compartment, sprockets, finals disassembled, I can see why any change to make it easier to work on would be beneficial.
I think the real answer would have to be provided by CAT, this is an old change.
They had D5's in the mid 90's that were not high track design, and as of late or somewhat late the D3G, D4G, and D5G were not high track, each of those performed well.
One thing is for sure, sit in the seat of one of these and get a rock, something projecting, steep slope with same, whatever clearance the sprocket has from bearing significant weight can and will change constantly, especially in soils around here, unless you are taking clean level cuts each time.
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