For the swords thing, I really don't get why shaman can't use them. They can transmog their mace into a sword... might as well let them use swords.
I don't see the whole 'daggers are the iconic weapon of the class.' Daggers were crap for the entirety of the BC expansion. They were also not really kings in vanilla either thanks to some potentially OP weapons that you could possibly end up with. I have no problem with daggers thematically for the sneaky type rogue, but I don't think daggers make sense for anything that favors a frontal approach which is essentially what combat is.