Criticism of FPV tools typically come from people with little or no experience of using them.
It is a different mindset to a certain degree but certainly not a toy or a waste of time.
The embraer ejets use FPV for everything except takeoff, and it is brilliant. Similarly the 330 uses FPV though the implementation, in my opinion, isn't as good as the embraer.
I have flown the 737 with FPV as well and when tied in with the track up display on the ND makes flying approaches much easier, even in an unstable machine like the 737.
I wish the 330 had the VSD like the embraer and vertical direct to, but alas it doesn't
