Altam's weapon is primarily a Lance, it's Sword as a secondary thing. (Like how Guard Cylinders are primarily Cylinders and partially Shields.)
Which is also the reason why I don't want it to be player obtainable, we don't want to muddy the lines between Lances and Swords.
The lines are already about as muddied as they can be, at least until they start adjusting the range of newer swords. Tons of stuff can get piercing and it's not like they're going to give weapons other than lances access to Lance Charge and Lance Counter.
Now, a hybrid sword/lance weapon would be pretty neat. Imagine something that gave access to all melee skills at once.