Hi, Lamont,
Thank you for your scientific interjections. Some of your points are worth considering.
For examples of straight bladed swords with fullers/Blood Grooves (does it make you cringe every time I reference that term?
), take note that the older Chinese Jian, the heavier battlefield versions (dating back to the Han Dynasty and before, to the Warring States Period), were often 2-handed or hand-and-a-half weapons, and were commonly designed with this feature.
Also reference Norse Long Swords, which were both cut & thrust weapons, most of which were designed with a wide fuller/blood-groove along the middle length of the blade.
Please also consider various spear and pole-arm blades from various cultures. The Japanese Spear, or 'Yari', on most examples, have a very deep Blood-Groove. Also reference countless bayonett designs. Bayonetts & Yari are primarily thrusting weapons, and I would argue that the purpose of the groove along the blade length has very little to with lightening it's weight.
The weight of heavy steel for real weapons is a benefit to penetrating armor, flesh, & bone, weather sword or pole-arm. Learning how to handle that weight, learning how to let the tool do the job, is one of the tricks to making them practical. Theatrical or sport weapons don't count here, where lightness is important for either a flamboyant display, or for scoring points. Just a different perspective.
Thank you for your thoughtful reply. :asian: