I think the OP has good points in it, but i really don't care, i think melee FF is good, and bad.
It does make it harder (but i like that) when fighting in groups, i think it adds a certain, i don't know, feel to it (cant really explain it.)
I think that with melee FF it adds a nice touch when fighting in formation, you can only thrust or use overhead attacks, except on the flanks, they can use left/right swing.
Any way, i think the best thing to do is make it a server side option, that way people who want it can have it, and people who don't want it don't have to have it, i think that it is a good idea to have this be for most things, because, on one hand people say they don't want it, while others say they do, so just give them the option to have/not have, it and every one is happy. (unless all theses people are playing on the same server, then things might get nasty

)