Inadvertently losing a mask while diving can be avoided by the use of a simple bungie/silicone necklace or lanyard, much like the backup regulator necklace used by DIR divers. I think the real advantage of this sort of mask is how it aids a diver with heavy task loading. Looking at a wrist or console for pressure/depth/time information is trivial, but may be forgotten or performed intermittently when in the middle of a complex operation, e.g. salvaging, mapping, or rescuing. Another excellent application for this mask, or to be more precise, a mask like the DataMask HUD/CompuMask HUD, is rebreather diving. A variant of the DataMask HUD could provide vital information for a rebreather user that could not be missed or ignored by the diver. Due to such advantages, I believe such mask based HUD devices are the future of not only rebreather diving, but tech and recreational diving as well, but obviously they must be affordable to most divers before they become common place.
The argument that masks are easy to lose and therefore an expensive mask is a bad investment fails to consider that most masks are inexpensive and so there is little to no demand for safeguards to prevent loss. When masks become expensive, masks will become more difficult to lose, either by design or by user innovation, e.g. lanyards. The most important question is how such a mask will benefit the diver, and I believe this mask truly serves those who perform complex operations while diving, which excludes most recreational dives, and thus, most divers (with average incomes). You only have to look at the price of the HUD mask to conclude that it is intended for a niche market.
Sadamune