Using Cantilevered Pontics in the Posterior Maxilla?

I just took a course at a national meeting in which the lecturer gave several examples of maxillary full-arch fixed partial dentures. In some of these cases, he only used 6-implants to support the fixed partial dentures. He had long spans and cantilevered pontics on the distal replacing the second molars.

I talked with my oral surgeon who is very conservative and careful. His recommendation is not to use cantilevered pontics in the posterior maxilla because 80% of the occlusal force on those pontics will be transmitted to the adjacent implant. Since the bone quality around the most distal implants will be at best Type III and more likely Type IV, he says this will lead to significant bone loss and eventual failure around that implant. He says the safest approach is to use a shortened fixed partial denture with no distal cantilevers. I would appreciate guidance on this. What do you think?