LEGO is literally just a toy company. They could make whatever they want, slap a LEGO banner onto it, and it is both literally and technically "LEGO."
And, I mean, it's not like Constraction is just ignored by LEGO. As has been brought up before, mechs, which are super popular, at least in my eyes, utilize mixture of Systema and Constraction that is both fun to build and looks pretty nice.
And I just love this set