Would love for melee characters to be more like seasoned warriors who carry 3-4 weapons and have the option to pick the best tool for the job.
What are you envisaging here? Characters can currently carry multiple melee weapons and swap them at the cost of an action, though it’s made inconvenient by buggy behaviour of the toolbar and the fact that key-bindings for custom slots I think still only work when you’ve already swapped to that toolbar. But presumably those bugs will be fixed in the full release, so I’m guessing you are looking for something else. Do you want melee characters to be able to select a few weapons they can swap between without any action cost, or to be able to shuck off or don a shield without action cost? More enemies that are vulnerable/resistant to different damage types to provide more incentive to swap weapons? Something else?
Personally, I have no problem with enemies with different vulnerabilities and strengths, but am not sure swapping weapons should be made less costly. Perhaps as a feat? Not sure if there are any relevant 5e rules? I believe that it is consistent with 5e that by default swapping a weapon in a hand takes an action, so BG3 is already being more permissive by letting us swap between a melee and ranged (or thrown) weapon without using an action, which has certainly been the subject of debate here before.
"You may call it 'nonsense' if you like, but I've heard nonsense, compared with which that would be as sensible as a dictionary!"