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There are axial loads being put into the system though and all that load is taken in the nds bearing as it’s the only one held axially.
The ds floats axially and is only supported radially.
On ht2, both crank arms abut the bearings and the axial loads are therefor split between the ds and nds.
I also think ht2 is superior as you have the preload cap adjustment, gxp only holds the nds bearing, doesn’t really preload it.
M_V
In my personal experience, when fitting my own GXP cranks, there is a little play in the crank arms even at 30nm+ and the required 40 just takes out the play as they get really tight which says to me that there's next to no axial load.
Now if your BB shell was 68.5 or 69mm wide which as you'll know is how they come from the supplier, the crank is going to be pressing on those bearings long before the 40nm required torque