ARR MSQ rework is one of the biggest quality of life improvements I've seen in a while. I'm sure everyone remembers how fetch quest heavy it was. I still tear my hair out at a certain quest line that goes like this; without posting any spoilers the summary is.
There's a major storyline battle ahead and you have to defeat a certain enemy in order to progress the story, but you can't reach that area without a specific item
NPC: Warrior of light, this is the item I need you to bring me back. Here's where you should look for it. Go fetch.
So you go on a series of quests that have additional side quests to them, essentially two or three SUB side quests just to complete the primary side quest only to finally get your item. And when you bring it back to the NPC you're greeted with this....
NPC: Oh I'm sorry, you brought me the wrong KIND of thing. It won't work. THIS is the right kind of thing. Go fetch it.... again!
So you go on ANOTHER series of fetch quests to acquire the thing you were supposed to get originally. Eventually you get it and bring it back to the NPC. Then you get THIS
NPC: Oh I'm sorry, you brought me the wrong kind of thing AGAIN! This one won't work either. Go fetch me the thing a third time
After that series of fetch quests I was absolutely livid with the amount of back and forth they put you through. Sure finally getting to the battlefield and defeating the enemy was a satisfying experience, and the cutscene that ensued was extremely enjoyable, but the amount of chores just getting to that point detracted from the enjoyment way too much. They could have completely omitted the fetch me this thing twice, but even if you had to fetch it twice it would have been so much better than forcing you to fetch it an additional third time. Making a player fetch the same thing three times in a row is just throwing filler content to take up time. HINT: Filler content isn't actual content. Fetching 100 McGuffins versus 1,000 McGuffins versus 10,000 or even 50,000 McGuffins is still the same content. It's just prolonging the duration.
I can't wait for 5.3. I'm actually looking forward to starting a brand new character to play from scratch because I burned out on the game two years ago. I never finished stormblood's storyline and so much has changed that I'd rather just start off fresh from the beginning. All of my equipment is going to be replaced in a flash anyway and the leveling up isn't that big of a deal. But I'm waiting for 5.3 to do it specifically because of the cleanup in the ARR quest line.