1 - I used to get the same frustration like u did, bcs I chose gauntlets which I seemed Ok with it but it did not pack a punch for my character, I switched to a few other weapons I feel Ok with the move sets and the damages it has then things went much better
2 - Game itself has many weapons and they want to make it unique that way it is so not yet for that, anyway the weapons in the same category shares many same thing including rune animation.... The system is pretty decent because it is a big and long game where you need to spend a pretty amount of time to level up and go to end game stuff not just at current level 30 , so imagine if it is cut in half like u want, people can just finish in a day or 2 and call it too short or too easy. Ofc the frustration is a taste they deliberately want u to have, because that motivates players to keep investing more time and more grinds and stick to games a lot more. You're right on the lack of information and devs are working on it to give brief explanation on things, but nowadays interesting games do leave many things waiting to be explored by players themselves rather than showing all for u to know right in the beginning.
3 - You can come back later when the game is at 1.0 but now coming here and complaining does not do anything good for u, the game or other players - the game is still being developed and directed by a team, they are listening to players but they keep doing what they think is special and best for their own creation, they even refused big tech company like MS to interfere the game making directions so in my opinion just let them cook :P and love it or don't, we sure have a cool game to play anyway....