Stop Giving the "Need" Command for Drop Gear in Dungeons to Higher Geared Players!

[Cordie]

Shouldn't PLD, WAR, DRK, WHM, SCH and AST get 100% the item after rolling Need in a light party?

You are essentially asking: "Shouldn't they get 100% after getting the item?"

You need to factor in the probability of seeing an item:
there are 7 types of left-side gear and 5 types of accessories.

I think you need to re-label the chart to be specific in the fact that your percentages factor in a hypothetically equal drop chance first before the ability to need is factored in.

Why would you assume otherwise? Go in blind, this is what to expect.
"After" rolling need , because you need to account for others potentially rolling need.
If the item type doesn't appear you will get null when "rolling need" (you can't even roll as a matter of fact).

Second, bardaboo rolling on everything does NOT mean there is agreement with your suggestion to dress up the OP's request as everyone can Need. Your attempts to twist words to fit your logic need some work. If I were to roll Greed on everything I can't Need, it means I'd like the gear if the person who it is designed for doesn't want it, not that I think all gear should be equally Needable. You basically tried to compare apples and oranges.

It's not dressing-up the OP's request. It's a suggestion satisfying both sides.
If you were to roll Greed on everything you can't Need you have a priori given up on the thought of all gear being equally Needable. There's no comparison for you there.

The system is designed to give someone who chooses to undertake a specific class/role priority access to gear useable by that class/role as a reward for choosing to undertake that class/role.

And it is skewed.