I'm GLAD this will be happening. Its annoying when people sit around and don't roll.
Too bad it doesn't even solve the problem, because even when you've already gotten your weekly loot, you can still hold up the line by not passing. (At least, this is how LotA and ST worked)

How is that not the issue? The issue is getting locked out on loot because you aren't capable of noticing you are fighting a boss, killing a boss, then receiving loot from said boss. It's no different than doing a dungeon or another raid zone that contains multiple bosses that drop loot.
Not always staying on top of the loot pool =/= not knowing what fights will drop loot. They're two separate issues, we're talking about A, you're complaining about B.

Yes, I've been that person before. Because I afked, and because I was more bothered about looking at other things during that time. And you know what? I deserved to get given the useless piece of gear I was too distracted not to see was being rolled on for an entire five minutes. So I didn't complain because I should have been paying more attention. As others should.
Well, I don't agree that's how it should work (and neither do many others, which is why they changed it eventually). Just because you accepted flawed game design based on arbitrary loot rules for this one specific series of raids, it doesn't mean we all have to.