HI Amin
Of course, this is true, and Fuji recommend shooting at f4 and above in macro mode . . . . . but limitations can be ugly . . or they can be an asset.
this was shot as close as possible with the X100 at f2 with the ND filter - you can criticise the photo, but I think the lens has come up trumps.
To be honest I'm not totally convinced by the fuji lens in all circumstances . . . .but there are very few lenses I could say that about (Leica summilux 50 f1.4 maybe?)
The good thing about the Fuji lens is that it's rarely anything other than charming. Something which could also be said of the panasonic 20 and to a lesser extent the Olympus 17 (strangely I find, looking in my cupboard, that I own both of these lenses, despite having no m4/3 cameras!).
all the best