That sounds like blaming Lays because you cannot just eat one chip.
Uh.
That would be somewhat of an analogy if eating Lays actually got you things like money and the system of Life made you better off eating more Lays.
A system which has an incentive to do X is going to have people doing X. Turning that around and going "Why are you doing this if you don't want to?" is a little bit silly.
The problem is, Tier Pieces and Trinkets will be considered interesting regardless of their ilvl. The ilvls are low enough that HC raiders won't need regular gear from LFR/Flex and Normal raiders won't need regular gear from LFR, which is good.
There's just not anything they can do to the tiers and trinkets ilvl wise that would prevent people from going after them.
The only thing that could fix the problem even more is ....
They'll be considered interesting, but that doesn't mean they'll be mandatory.
And just to note - "HC raiders" encompasses people whose only hardmode content is Jin'rokh. They're still going to be using 517's and 509's in slots , if they did T14 Heroic at all, which is unlikely. Normal mode raiders encompasses people who don't even have Megaera down. They'll still going to be benefiting from 502's/510's.
Or, you know, a loot lockout. Except instead of "first one you down in the week", with the option to actually specify "I don't want loot".
Moreover, I'm pretyt sure Dragon Soul WAS where they adjusted the proc rates on LFR weapons so that they wouldn't be godly must-haves. Certainly it's an option for LFR trinkets, which will still be an upgrade for its intended audience if UVLS' proc gave 40% crit with an adjusted proc rate or some such, or if the Tier pieces modified the strength of the set bonus etc, or if the LFR set simply had separate bonuses.
It always sounds like heroic raiders just dont want LFR/Flex gear to be good at all so they don't get tempted to do them in the slightest.
And obviously Blizz doesn't think the heroic raiders' worries warrant enough to actually change the loot system for people that aren't heroic, since that makes most of the raiding population.
That's the reason why I say Blizz shot it down, because they obviously disagree with heroic raiders.
I remember Dragon Soul, with people here in the forums complaining that LFR Dragon Soul should be giving blues, with trinkets and tier pieces completely different from normal/heroic so as they, as heroic raiders, would not be tempted to run LFR.
I'm pretty sure Heroic raiders would be happy just not having an incentive to do LFR. If the gear stays exactly how it is but there's a loot lockout so that the only time you would ever have to go into LFR is if you've missed a boss by being on standby, I expect it would be fine.
And that "obviously" doesn't even make sense. Blizzard obviously think those are warranted comments, because they've gone to lengths to at least give the impression of minimising it somewhat, and ARE in the future going to be discussing the benefits/implementations of divesting things further; it's not something to just spring mid-expansion.
What actually follows is that while they have a high-level idea of the problem, someone like Watcher doesn't completely understand the finer details. "And yes, while you could upgrade your Flex 540 to make it superior to a 541 or 543, you won't -- if you're a Heroic raider today, you'll be getting 553+ Normal mode loot the moment Siege of Orgrimmar opens, and upgrading that will be a priority." for example doesn't quite bear scrutiny, because upgrading a 528 godly trinket twice is going to be more meaningful than 8 ilvls on a 553 ring. Similarly, upgrading a 540+8 Chest will be better than 8 ilvls on a 553 Ring. Part of the entire point of their reduction of Upgrade costs was to make Upgrades easier to decide on, so this isn't an either/or ANYWAY - unless you literally get showered in more than 2 pieces every week.