Yeah but force edge was a shortcut
Remember how the Force Edge is the weakest weapon in DMC1?
It's not the true form of the weapon.
Vergil picked up the Force Edge as just another weapon and it didn't power him up in the final battle.
Sure, he gets Round Trip, Stinger and Helm Breaker but that's because like Dante, he can adapt to any new weapon he picks up.
The final battle with Vergil is still you going up against his own power.
I'll bet the Force Edge is weaker than the Beowulf he picked up earlier.
You gotta also remember that you can't Devil Trigger with the Force Edge.
This explains why Vergil needed to wield both Force Edge and Yamato at the same time.
Also vergil casted aside his humanity in dmc 3,
Then he could have pooped out V a long time ago but didn't.
Notice how he only did so after losing to Dante twice?
It's the same as DmC Vergil taking his loss so hard that he "killed off" the people close to him in his mind.
The whole thing felt like desperation or lashing out to cope with the pain of failure.
You lost to Dante?
Yeah, blame it on your human side.
but I think they are completely fine
Then you'll never improve nor notice when something could use improvement in your life.
If you think writing giant wall of text with no formatting or paragraphing is "completely fine", then there's something wrong with you.