Personally I wish they'd just let you pull up a "hunting" menu of items in the dungeon and let you pick the ones you want to loot. No public loot pool, just custom odds for the stuff you want dropping straight to your inventory.
The issue with that, if I understand what you're saying, is that people would gear up too quickly.
No seriously.. in leveling content it wouldn't matter so much. But at endgame it absolutely would. You need people to be doing this content for a system like the duty finder to work, otherwise queue times quickly balloon into the absurd as people get the gear they want and stop doing it.
Difference between casual and hc is almost zero
You don't know what you're talking about here. Your statements only make any sense at all if you consider gear to be the determining factor in whether a player is skilled or not; which is a patently absurd thing to say.
Let's take a trip to statistics land~
In the previous tier of WoW raiding (Tier 13, Dragon Soul):
62,648 guilds were documented on wowprogress as having participated minimally in raiding, or roughly 800,000 players give or take.
Of those, 1,300 guilds never killed the second boss of the instance on normal difficulty.
And when we get to the top end (the guilds that cleared the entire instance on heroic difficulty), we find that only 14,126 guilds (or roughly 200,000 players) killed the final boss on heroic.
So what happened? If the difference between casual and heroic is nothing, where did those other 600,000 players go? Could it be that, in fact, there's quite a large difference in what players are able to accomplish? That perhaps, even having gear from LFR (which existed in that tier) isn't enough to propel someone to the top, far beyond their actual level of skill?
Hell, let's go even further and look at the Glory meta achievement which, if you're unfamiliar, requires you to perform strange tasks while defeating all these bosses. It looks like 6,398 guilds got that, or roughly 10% of all tracked guilds.
I realize that WoW hurt you in a fundamental way when the designers realized they were spending a ton of time on something only a tiny handful of people would ever see. But if your entire thesis is that they've removed the distinction between casual players and top-end raiders, you are absolutely wrong.