True, I suppose the awkwardness of Support Paras does do a bit to try and keep Airborne relevant. It could end up as better Airborne.
Airborne also has a proper Anti Tank Strafe and their paratroopers are different paratroopers.
One being good is not going to render the other obsolete. That said, airborne should never have come with two different team weapon drops, it's excessive and clogs up what could otherwise be a useful commander ability.