I don't think you care about compelling arguments at all, but is a fun topic to talk about anyway.
First, no need to diminish the impact is has. It's low, we agree on that. But even if it's low, is still negative in the longt term for the game.How does this matter? If you are 340 doing 340 stuff, how does getting an item that makes you 341 or 342 matter? Answer: it doesn't. Getting a WF every ~20 items barely boosts your overall ilvl and getting a TF is even less frequent than that. If you are only doing 340 stuff you'd probably need to run enough for a hundred items to drop for you to get upgrades (assuming you are full 340).
Effort = reward should be the basic rule and each effort should have an apropiate reward. It doesn't really matter if the chance is low or if it just gives you 0.01 more average ilvl. A system that randomly gives a better reward for the same effort is not good for the game.
Or you can get it on the first kill. That's the problem. Luck is not the same as effort.Wrong. Titan Forging / War Forging does reward effort. You want a 385 piece from doing Heroic Raid? Do the raid like 100 times and get 1 piece. That is a shit ton of effort.
Effort in this context would be if titanforging was a system to upgrade your items. You get your 'whatever' points from doing all types of content, when you have X points you can go back to the city and add 5 ilvl to any of your gear.
Then yes, after a a few weeks someone that just plays LFR can have a really high ilvl on one slot and that's fine, because he did in fact put the time for it, he saved his points and made a choice between raising his average ilvl across all his gear or getting one single slot to the top.
But that's not what we have here, what we have is RNG.
I would totally support an upgrade system like the one described BTW.
Having a BiS list has nothing to do with OCD about not having that gear, because in fact, that rarely happened, is about having a finish line that feels realistic.Who cares? If all the content you do only requires 385 ilvl (which btw it only requires mid 370s) it doesn't matter if you have "bis" or 385. People having OCD about not havin the absolute best gear possible is a personal issue not a game design issue.
In the past you got your BiS gloves and that's it, good for you!
Now you get those same gloves, but RNG comes in and maybe they are BiS, maybe they are not, maybe they even have a gem slot!, or maybe you have another item on that slot that has a higher ilvl because of reasons... too much RNG involved.
Also, it doesn't really matter if you need it or not, you certainly don't need to be full BiS to be able to raid mythic (that would be stupid, right?), but having that kind of goals is a fun way to keep farming content interesting.
Titanforging fails to do that because, again, there is too much RNG involved, so it does the oposite. If the chance is too low, why even try? if it takes too long, why even bother? And that's a design problem. When they intentionally made BiS lists obsolete, did they consider if the replacement was fun or enjoyable or as with many changes the only thing they really cared about was time invested?