The main problem is not a lack of damage for melee characters. The main problem is the low chance to hit severely limiting the builds and equipment choices.
What is needed is multiple sources of + Attack Rating, so that all the skills that give % increase in AR can actually have a base AR to work off of.
For example, currently a Superior Weapon can give up to 15% Enhanced damage, but only gives between 1 to 3 plus Attack Rating.
How does that make any sense?
You need at least 100 to 300 Attack Rating to make any kind of difference.
My thread here addresses that and other suggested way to increase chance to hit on the base items:
Suggested Changes to Base Weapons for 2.5 - General Discussion - Diablo 2 Resurrected Forums (blizzard.com)
I guess everyone just found it too boring to bother reading or responding to. But seriously, if you actually want to help the non-caster builds you are going to need to do something boring and basic to change things so that we can actually reliably hit the monsters in Hell difficulty.