Remember, this is a prototype. It is not what the retail version will be, as I mentioned, it will be much smaller in size yet reportedly perform better due to 3 condenser cores vs 2 in the prototype.
Also, recall that the TR4 socket has built-in mounts for coolers, not just holes for a backplate. Dispersion of this weight over a larger socket area allows for better retention and support than having the mounting holes closer on smaller sockets. It's the same reason you can mount a large TV on drywall if you have a larger mounting bracket which covers larger area vs. just having it hang on a single, small foot.