They should have done a line of these weapons that have different damage types that includes WS damage. That would have made Odyssey Gaol fight job setups at upper veng levels so much more interesting.
It would mostly be a big change for MNK and PUP, but other than that Idk.
Slashing polearm wouldn't do much, because all basic polearm WSs are rather weak. DRG would be better to just Naegling, even if that would create wall issues. It's hard to imagine blunt polearm, but it would be the same deal.
WAR blunt gaxe probably wouldn't matter, because without /sam and Hasso, WAR 2h dps is significantly worse and I can't imagine blunt dagger, so there will be no DNC main to support 2h build with haste samba. Loxotic Mace and Judgment would be simply better. Shining One is far better, especially when paired with DNC haste samba, than any possible piercing Sword and doing piercing Savage Blade without Naegling bonuses.
I guess piercing scythe is somewhere on the edge of my imagination, but would Cross reaper be good enough on it's own? Maybe if paired with WAR and Savagery, but then WAR will lose Haste Samba from DNC, seems meh.
Blunt Gsword is something, that maybe could make DRK available for Ngai I guess.
Same for Blunt Gkatana I guess. It would also be funny to have SAM slaying hardest mobs with Kendo sword lol
Both probably still worse than MNK and PUP
Blunt Axe wouldn't really help WAR, you have club already with similar WS and I doubt it would make BST viable for Ongo.
Ok I guess a slashing dagger could bring DNC to Kalunga and Mboze.
TL;DR Really I think it would mostly be a MNK and PUP opportunity to join Xevioso, Kalunga and Mboze and DNC to join Kalunga and Mboze. Especially PUP could change those fights a lot, because automaton can tank both adds without a problem and Howling Fists is a very decent WS for low attack scenario.