I think the loft and bounce options around specialty wedges really do give them the advantage over stock wedges.
If they fit nicely below your stock PW carry numbers that's great, and if they don't you generally have the option of adjustment of loft to make them fit.
For me based on carry average only:
LW - 60 degrees - 60 meters
SW - 56 degrees - 72 meters
AW - 52 degrees - 85 meters
PW - 47 degrees - 102 meters
Then 3/4 and 1/2 shots with each club cover < 60meter shots at most ranges.
Always thinking about potential better combinations, and I could get a degree adjusted to space them out fractionally more but in the end the main goal is to have confidence in the selection of club so we can focus more on the quality of shot/contact and less on "do I have the right club for the shot"