I think the evening departure will work well specially if headed to the west coast (given the ~1900 arrival time you'd only get into a relatively small late bank of west coast connections from LAX, if at all, plus redeyes to say DFW/ORD/JFK/BOS).
If your origin is MEL or BNE/SYD/ADL your natural body clock will be winding down(hopefully

) so a dinner on the plane (or lounge), a couple of drinks, maybe a movie and you're down for the evening to have a sleep within a couple of hours, or say ~11pm local MEL time. Far better than trying to "force" a sleep much earlier in thhe cycle when departing in the morning from Oz. Plus the evening arrival into LAX means same thing.. a few hours, a late dinner and you can get some more natural sleep into that timezone (not going to work with redeye connections to the east though).
I certainly would consider it as a great option if I was going to the West coast since you're NOT arriving at ~7am/~10am after flying it's less rough on the body to adjust to the timezone I think.
I felt much the same with (soon gone) QF9 evening departure from MEL to LHR arriving at lunchtme was much much friendlier than the QF1 or soon to be QF9 arriving at 0darkthirty.
my 2 cents