I'm all for large varieties of basically everything, since the modern day principle in the creation of video games seems to be dumbing down absolutely everything. That being said I also have to say that variation only needs to be, where it has to be.
Long Swords, Katanas, Scimitars and the like basically behave the same way. What kind of advantage would it be if they were separated into different categories(or skills) like curved sword, longsword and"exotic" sword?
The same applies to Twohanded Swords like the Bidenhander, Claymore, Espadon, etc). Same(or at least very similar) basic principle for usage in combat.
Polearms can be divided into Pole Axe (Halberd, Bardiche, Glaive, Naginata, Guan Dao, Voulge) and Spear (Pike, Ranseur, Partisan, Guisarme). Weapons in the category Pole Axe have a Blade for slashing/hacking the enemy to pieces at a distance/hit them when they are mounted and weapons in the Spear category are mainly used for Impaling enemies and getting them from the backs of their horses.
Do we really need more ?
As long as there is the option to choose a Talent/Feat to specialize in a specific weapon subtype, we should all be fine