The great advantage of the Paterson/MOD54 setup over rotating tanks or trays is the ability to use semi stand and stand development, and especially with tanning Pyro developers. It gives far more control over highlights and shadows. But yes it does use more liquid, although this is the last consideration on my mind.
There's no advantage, you can do that with any tank.
In addition the MOD 54 ccould be used in some JOBO tanks where there's a a centre column, I use my Paterson System 4 reels in JOBO 2000 series tanks.