THIS is a good argument. It's very true, not all grinds are designed equally. What needs to be understood though is that not all of the things available in the game are going to be accessible to you. For example, if you really don't have the drive to raid, you're probably never going to get Coil loot. If I said that the design for gear acquisition was complete shit because of that, what would you say? Would your reply have something to do with (or be a result of) the design of how an MMORPG works? If so, that's exactly how the general grind and reward structure works as well. Modern gamers are WAY too used to the idea that everything in a game must be designed for them and only them. That if a single aspect of a game is "bad" to this one person, it is a failed design choice. The way they designed the reward system is not wrong, nor is it bad. It's the name of the game.
Can they make it too long for any of us individually? Sure, of course... doesn't mean that it's bad though. When you look at an MMORPG and judge things to be good or bad (particularly the grind aspect), you can't just look at a single thing about it and determine that. In less than two weeks, people have amassed over 300-400k+ MGP... TWO WEEKS. I've only been doing MGP grinding for around a quarter of my time on the game, and I still have more than 200k acquired (all spent on misc stuff, mainly gold packs). That means in a little over a month or two, if they really wanted it, they'd get the prestigious Fenrir mount or Cloud card. Personal achievements that serve no purpose but to flaunt... but really, how often do personal achievements NOT result in that. At the rate I'm going, that'd mean I'd make 1mil in around 2.5 months. Is that too long for an MMORPG? If you think so, not sure why you'd think an MMORPG is not designed to cater as a second life... since you know, that's kind of what the point of it is as a form of entertainment.
If you rage at RNG here, you may learn a new hate for the die lol. I know I did.