ccs
41st lv DM
A long-sword does as much more damage over a scimitar as a scimitar does over a dagger. That's not "nearly as effective" or anything like it. The wounds are significantly more grievous, or else the difference wouldn't be worth expressing in the game mechanics.
I'm sorry, I don't belive my character(s) would be able to discern a potential 1.x points worth difference wound-wise between most of these: https://www.bing.com/images/search?q=scimitar&FORM=HDRSC2 and most of these: https://www.bing.com/images/search?q=Medieval+Longsword&FORM=RESTAB. (ignoring all non-sword type images of course)
I'm assuming 1 handed use here.
Either way, mechanically, after about 30-120 seconds of game-time the foe falls over dead once the stabbing begins. So if I'm playing the scimitar wielder it's not terribly important if I'm doing (potentially) 1.x pt less damage per hit than you think I should. And if that 1.x IS that important to you? Then you take this game way too seriously.