You guys are confused about beading and sheeting. A good sealant/wax that beads will also sheet. It depends how the water ends up on the car and where the water is. Mist water on, it will bead, especially on a horizontal surface like a roof or trunk lid. Dump/pour a bucket of water on your car and it will sheet off.
Notice the difference in how the water reacts with the paint with the pressure washer vs the hose:
https://www.youtube.com/watch?v=Vvd0cT8ubeM
A wax and a sealant are no different with respect to how they sheet/bead. Some brands behave slightly different than others, yes, but both create a hydrophobic layer which behaves like in the video above. A wax is just natural (carnauba based) and a sealant is synthetic.
Here is a video of a 100% carnauba
WAX. Notice how it behaves identically to the sealant I linked above? It just depends how the water is applied.
https://www.youtube.com/watch?v=DGkp_3oxOHA