Point 1) keeping fixed attachment between elements ensures proper gap, as well as transmition of loads. Loads transmit downforce where needed, but also flex the wing, reducing drag on straights
Point 2) It's usually a trade off between FIA strength requirements and desire to allow wing bending to reduce angle and drag at speed. For lateral stability two pylons are better than one. For aero losses, two thinner pylons are better than one thicker. It's not really a detrimental thing, but I feel teams would like to keep as much lateral stability as possible, to reduce stress on beam wings and keep them light. So overall, Ferrari solution is more than OK.