Rc.conf: difference between MODULES=() and MOD_BLACKLIST=()?

Is there any difference between
MODULES=(!foo)
and
MOD_BLACKLIST=(foo)
I just think that maybe the MOD_BLACKLIST could be ripped out of rc.conf and only use MODULES=() with a ! to disable a module like in DAEMONS=() to clean it up a little bit, if those 2 are the same...
Of course there is a difference, since MOD_BLACKLIST can't load modules, but all the functionality of MOD_BLACKLIST can be done by MODULES, right?

keeping only MOD_BLACKLIST wouldn't be good since you can't manually load modules then, but only NOT load them.
with only keeping MODULES it would be more like DAEMONS: you can specify the stuff to load AND you can prevent stuff from being loaded by putting a ! infront of the name.
but hwdetect would have to be rewritten to use MODULES and since hwdetect comes from tpwoa and he uses MOD_BLACKLIST, my guess is that this is not going to happen
as seen in this thread there are some people that like the MOD_BLACKLIST and they wouldn't be happy when they'd have to put the stuff into MODULES, so you can't make everyone happy.
I just thought that it doesn't really make sense to have two almost identically things in the rc.conf as it keeps all the other stuff so simple with ONE place to edit most of the system stuff in one file and imho the two ways of preventing a module from being loaded in the else so simple config file doesn't really fit in.
I don't have a problem with both arrays staying since I don't have to look at them all the time but it just feels weird to me.

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