Ok... where do i begin :
Skill requisites are there from the get go since clod. Applies to every class , not just barbarian. For instance , you CANT have Battle Orders before spending at least 1 point in Shout and etc. So i dont know what you mean with that.
This is supposed to be a full revamp mod. That means what makes sense like barb leap , WW (theres Windform oskill here thats basically WW) or necro summoning undeads from clod got trashed to make room for fresher archetypes. I can see where youre coming from with this tho, i was hard to wrap my head around this concept at first but you just get used to it and frankly it makes classes fresh if youre burnt out from same old builds in clod. There's a lot more variety here.
Monsters with immunities are also a clod feature. It makes me wonder if you ever played the vanilla game at all. If you have you will probably notice that from Nightmare to Hell ALL monsters get 1 or 2 immunities , so you need to rely on a merc for outside element damage or just physical if youre a sorceress. Barbarian in median in particular has quite an array of skills to deal with immunities, meaning he DOES have skills that convert your damage into an element (Iceburst , Stormblast, etc).
Dont take it as flaming, i honestly empathize with the stuff you typed, but you need to spend more than just 1 day or 1 week playing this mod to understand all its features, if you try that you will see that many of your gripes with the mod are unfounded.