The only class I know of that does higher twitch-DPS is fighter, and that's only against trash. Against raid bosses or portals, even fighters do worse DPS twitching. Do you have a citation that suggests otherwise?
Outside of rogues and rangers, TWF and THF are very comparable, currently. Neither style has a dramatic advantage.
1. If glancing blows are simply added back to twitch-DPS, THF will experience a dramatic increase = unbalancing.
2. If the twitch speed increase is removed, then moving and stationary will be the same DPS per landed swing. I for one think that the continued presence of the ability suggests it is either intended or simply not going to be changed.
3. If (1) is enacted while nerfing eSoS, that is just really bad form given the effort required to get one.
With these in mind, I support the status quo.