fighting style
It seems like a full knuckle guard could get in the way of some fighting styles, for example (from the movies... :P) if you switch hands while fighting a knuckle guard would really get in the way.
A general crossguard could also get caught on clothing, etc... during wear (perhaps during use as well) and so would not be desirable in that sense, also an overly large straight crossguard can impede the wrist/forearm.
my $0.02
j.
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