I was too lazy to post more updates so I have quite a lot to say. I will try to be brief
I am now done with FFXIV as the free 30 day subscription that came with the game has run out. A few days ago I was planning to renew (though perhaps not immediately) but unfortunately my final few days have scared me off.
I managed to get up to the final Heavensward quest (not including Dragonsong War), at which point I had my monk at level 59. By doing most of the remaining quests in the final zone I was able to hit 60. I got started on the first stage of the final quest (which apparently also involves a dungeon and a trial), but unfortunately it was far too hard. I never really struggled with the previous quests but the three crappy enemies that ambushed my just did more damage than I could possible handle with my character's abilities. I was barely able to hang on and kill them but then another wave appeared and it was clear that I was not going to see the end of the expansion in the time that I had remaining. It was a bit of a shame, but since I had hit 60 I was now free to level some other classes without having to worry about losing my rested XP bonus.
This was where things really started to go downhill. I attempted to get the most out of my rested XP bonus by continuing with my goldsmith, but it was clear that beyond about level 20 it is more or less impossible to get anywhere with vendor mats. Since it had been a massive grind even when the vendor was standing right next to me with all the supplies I could need, it was obviously folly to continue.
I gave up on crafting and switched to gladiator. Tanking is clearly where it's at since they get instant queues for everything. But... the grind. Just getting to ten by killing things, filling in my hunting log and doing the class quests took a horrifically long time. Trying to level any further doing that was not going to work.
I gave up on gladiator and started mining. Mining was also a grind, although it did not feel as boring as just killing stuff. Still, getting to 10 took so long that going any further was not going to work at all.
So I was done. There just wasn't an enjoyable way for me to level additional jobs. Apparently the only options are a truly horrible amount of grinding or switching the game off and waiting a few days for your leve allowance to replenish. It seems I only managed to level the first time around with the help of the story quests, but even if I could repeat those I wouldn't want to due to the horrible amount of pointless travelling involved. With nothing interesting to do I had no reason to renew my subscription. It is not impossible that I may decide to go back to the game at some point in the future but it seems like doing so probably won't be a whole lot of fun.
Incidentally, I did eventually get my monk relic weapon. The quest was far longer than I expected so I probably should have just abandoned it before I had spent any money. Still, I found out that there are materia melder NPCs in town who will slot the stuff for a fee, so I just did that to complete the first step. After a lot of the game's trademark to-ing and fro-ing and progression-blocking dungeon queues I finally got my hands on my relic. It turned out that the original tool-tip had lied to me and the weapon wasn't far superior as it had suggested. In fact, it did less damage than the weapon that I currently had equiped. Typical.