hello to every one,

i hope that we talk about the same thing in this topic, namely the slope in the top left corner of the weight & balance enveloppe,where the weigths are high with a forward cg location.
the left upper corner of the enveloppe is cut off to alleviate the weight constraints on the nosewheel strut.

Certainly a minor consideration, but I suspect that the main driver, generally, is to keep the certification stall speed down .. which involves a bit of a trade-off in loading flexibility.

The operational limitation involved in losing that portion of the envelope is, for most aircraft, preferable to the performance penalties in retaining it.

Another consideration is tail loading.