What about elemental attack builds?

I'm doing my build for the Avatar of Fire keystone. It converted 75% of my sunder damage to fire, but what about the other 25%? There is simply no way to do this in the game.

And why does Ancestral Warrior Totem work so strangely? When connecting Volcanic Fissure it creates fissures but they don't interact with my Sunder. This could be a good synergy, but in the end it’s some kind of useless totem =_=

What about leech elemental attack damage? Apparently they forgot about this in the game too.

The charges, as I understand it, are useless. Generating them just to consume them is quite doubtful.

It seems that many years of development experience were not involved in the creation of this game.

The generation mechanics are also questionable. In 2 minutes of afk under Magma Barrier, I was unable to generate 3 endurance charges. The other options are even worse.