To add a little more perspective,
Flex is often used as a substitute for bars, so it makes sense to orient them the same way as bars. Most modern System sets do not remotely use it as flex, just a way of getting bars of arbitrary length.
You could always reorient them in the part bin (eg. so they go across the diagonal). That might be nice for other parts too. Take a leaf out of LPub's book and have an excpetions list for parts that need to be rotated differently.
Flex is often used as a substitute for bars, so it makes sense to orient them the same way as bars. Most modern System sets do not remotely use it as flex, just a way of getting bars of arbitrary length.
You could always reorient them in the part bin (eg. so they go across the diagonal). That might be nice for other parts too. Take a leaf out of LPub's book and have an excpetions list for parts that need to be rotated differently.