In the proto design, the stainless steel handle brackets tie in to the top of the housing with m5 screws. Strobe mounting balls could certainly go there, providing one on each side, and more options than some of the smaller housings have. A crafty user could also come up with a nice wrist strap mount tying in to that top m5 hole, and one of the bottom handle mounts.
My take on this is that more advanced users tend to (statistically speaking) want handles on both sides, and this supports that more cleanly than an optional tray system. They could certainly be removed for special configurations.
The inverted trigger style release has worked well in in the past on some housings where handles were optional, namely the old Olympus PT-E series. Given the similar form factor that may hold true here.