No, I am not. You're just insisting only your perspective has any merit. And you're arguing in circles. Nerfs of any caliber-- according to you -- result in overall player apathy. Therefore, how can any be reasonable? Say they left mount drops at exactly the same rate. A person waiting several patch cycles will always have a far easier time because those bosses are going to melt. Look at Garuda. No one does her mechanics anymore. You have premades with a single tank, a single healer and six DPS who utterly annihilate her in a few minutes tops. You really don't even need a healer nowadays if the tank can handle it. Good luck trying that back in 2.1.
Hmm, going out on a limb here but I suspect that $65 price tag might be a good deterrent. You're acting like the Lightning Event, or other like-minded, were monumental. I guarantee you the players unsubbed now, would still be unsubbed even if every piece of event content remained lost in time. They unsubbed because they were bored. Running Ravana a hundred times would likely contribute to said boredom not alleviate it.
Because generally people want it now. They don't want to wait a year. Look no further than the recent delays to No Man's Sky and Final Fantasy XV. People lost their collective minds over two months. Here's the thing though, if you make so players who have played for longer have a distinct and continual advantage over those who don't, you will never see new players. I started around HW's release. Why would I continue playing if no matter what I do, someone from launch is ahead of me not because of their individual skill, but because they picked up the game before I did?
You also continuously ignore other outside factors. Legion is a massive expansion. And seeing a number of FFXIV players are either former or current WoW players, this will inevitably influence these numbers, especially when we're in a "catch up" patch-- oft criticised for not having enough to do for people already "caught up." Once again, I guarantee if by 4.0, we saw three Primals, a complete and successful overhaul of Diadem, objective and/or more dynamic based content, no more tome grinding, and just more to do in general, you'd see people sticking around longer. For some, one primal and two faceroll dungeons just isn't enough to keep them playing even with PvP and PotD. No amount of mounts, minions or gear will change that even if it lasted for years. (Mount drop rates technically last a year, btw)