I mean that's not even close to nonsense. When someone randomly gets an item that can be up to 50 item levels higher than what you've gotten, you are being punished. You are getting penalties.
When you've put down hundreds of hours in search of loot like that so you can avoid being a detriment to your raid when you're already playing a heavily undertuned class, and you see Johnny Bozo in LFR get a 950 trinket, that leaves an incredibly bitter taste in your mouth. Mainly because nothing you have done to this point even matters because it's entirely RNG.
The system is inherently rewarding players that play less and care less about their gametime, so of course casual players are going to enjoy the system. It's just utter goddamn insanity to me how anyone could enjoy such a system where you have no idea if your 2000 hours into Maw of Souls runs or some shit like that will even yield a Titanforge.
Also regarding the bolded part;
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There is nothing interesting about it. Either you score the bullshit lottery and get extra stats, or you don't score the bullshit lottery and JC remains useless.
Also yes I am bitter. I love this game and I have since day 1, but it's getting so goddamn hard to enjoy playing it when they stuck us in the RNG hamsterwheel for the entire goddamn expansion. I used to love having alts that were somewhat similarly geared and decked out, but now I can't even maintain one without having to reroll the class again because the first two legendaries was Sephuz and movement boots.
tl;dr, yes I am sure this works for very casual players, but it's genuine purgatory for anything trying to be the best they can be for their mythic guild.