I am going to sound like a grumpy old man but I think I'm one of the minority that feels casting is already much stronger than melee. I think the few immunes are a fine speed bump for them.
And thats the Problem.
Immunities are a speedbump (talking from a solo melee Perspektive).
It Just Costs time.
This Game isnt about fine-tuning a strategy or adjusting Gear for certain situations (execpt MM or elemental education) to Progress.
It was built to click from 1 to mq. (Like Back in the good old days)