Alright, here are some numbers and comparisons. The long espada with only 27c and 28p is a good example of a weapon largely becoming ineffective due to simply having too low of damage even if they have reasonable length or speed. The Side Sword and Espada are also good examples of this. When 1h thrust was good and it was possible to have a 1h build centered around thrusting, like the GS/GGS, they were mostly fine.
But then we have weapons like the Broad Short Sword with only 85 length, 26 pierce and 28 cut. I'm sorry, that's a piece of shit weapon that might as well be removed from the game. The 1h thrust is too poor of a thing to be able to carry that sword to usefulness. 6K gold and it's a failure in 2/3 stat areas.
Meanwhile, we have the Elite Scimitar with 100 length, 99 speed and 31c(fairly low, but the other stats are pretty good so it works in the end). The NCS, 102 length, 97 speed, 32cut, the ACS, 105 length, 35c and 95 speed(low speed, but the length and damage are massive in comparison to all other options.) The Picks, with 97/98 speed and 30/32 pierce damage for their short range. Do you guys see the theme here?
All the high tier 1h weapons have great stats in 2/3. While it's possible to have a weapon with only one really great stat and still be good, we have to realize that when you completely forsake the other two for one, you end up doing one of two things. You either end up with a poor trade off weapon or a weapon with stats so low in other areas, that the weapon became utterly useless(Wakizashi vs Any random axe, NSWS vs NCS).
We have a problem with 1hers(specifically the weapons with "Short" in their name) where we think speed matters more than length, but that just isn't ever the case. Without a good amount of damage, your speed simply becomes worthless. Why? Because of game mechanics that are counterproductive to high speed, low damage weapons. Hold mechanics, armor, glances, risk vs reward with chambers, the correlation between weapon length and kick success rate. Length provides while extreme speed, when offset by too low of damage/length amounts, just adds risk.
Yet the opposite simply isn't true. You can actually have extreme length with comparatively low damage and speed amounts(glaive) and do just fine. You can have extreme damage with low length and low speed and still have a reasonably good weapon(GLA/LWA).
Short Arming Sword
weapon length: 81
weight: 1
difficulty: 7
speed rating: 103
weapon length: 81
thrust damage: 26 pierce
swing damage: 26 cut
How exactly do you argue in favor of using this thing, ever. Somehow the103 speed is supposed to make up for getting outranged by just about everyone and having inconsequential amounts of damage?
Here's a simple comparison that comes to mind regarding popular high tier weapons and an unpopular seemingly lower tier cut damage weapon. (I know the steel pick is used more than the military, but there is a very good reason the steel pick is used over the military, and not because the military is bad, but because there is really no benefit to not choosing the steel, and so for the sake of a simple comparison I chose the the military).
Italian Falchion
weapon length: 70
weight: 1
difficulty: 11
speed rating: 101
weapon length: 70
thrust damage: 21 pierce
swing damage: 34 cut
Military Pick
weapon length: 70
weight: 2
difficulty: 13
speed rating: 98
weapon length: 70
thrust damage: 0 pierce
swing damage: 30 pierce
So 3 speed on what are already high speed weapons (you get larger returns on wpf from low speed weapons) is supposed to make up the damage difference? Sorry, pierce isn't such a trivial thing as that.
There are so many problems you could literally go on for hours with this.
/rant
Sorry for not composing this better, it started out as a facepalm reply to a post in a different thread and right now, I just cba to clean it up.
Edit: I should add, I'm not saying you can't do good with these weapons, obviously a good player can do good with just about anything. It's that when you analyze the weapons from as many different directions and perspectives as possible, you really start to see the trends that create imbalances.
Edit 2: I also do not believe these current high tier weapons are deserving of any sort of nerfs. What I do believe, is that much like what happened to 2h rebalance recently, we need to buff the weaker weapons instead.