I applaud you for voicing your concerns about the game. Unfortunately, the official forums, particularly the general discussion section is rife with sycophants and people who turn a blind eye to this game's many flaws. While they cite evidence of people who are happy with the game and deny, deny, deny any flaws that people try to bring forward, I can do just the opposite.
Since 3.0 has launched, I can point you to dozens of players whom I know for a fact played from 2.0-3.0 or even 1.0-3.0 have quit this game for these very reasons listed in this thread. Is it anecdotal? Sure, but when I can personally point to dozens, not one, not two, but dozens of players that quit who had been subscribed every month from 2.0-3.0 there is a problem. When I am in multiple linkshells whose activity has been decimated since 3.0 launch there is an issue. If my own FC and the few linkshells I am in that are still active have become revolving doors of players quitting and newer people joining there is something wrong. This growing dissatisfaction is unprecedented behavior in the history of this game since 2.0 launch.
As of patch 3.25 many of these players have yet to come back and even refuse to come back unless SE starts taking a different approach to endgame, which will most likely never come. Several of them are hoping that 4.0 will make those changes. Sadly, I'm not going to hold my breath. This first expansion has already demonstrated the limited scope (3.0 Relic) and poor decision making (Lord of Verminion) of the development team, as well as provided us with plenty of examples of their desire to continue with tired methods, 2 linear hard mode dungeons every patch, etc.
Regrettably, I'm not sure at what point philosophies changed between 1.17+ and 2.0 to create this situation where SE felt the need to cater to the lowest common denominator. Undeniably a desire to increase subscriptions, which is an admirable goal. Unfortunately, to say that nothing of value was lost in this endeavor and that it is not having a negative impact on the game is living in a place of denial. Players have become tired of a lot of content that is admittedly from a gameplay standpoint lacking in creativity, an accusation I do not make lightly. The most inspiring content in 3.0 that we have received is probably Ravana EX, Thordan EX, Sephirot EX, and Alexander Savage as well as Diadem's concept, which in my view was poorly executed. Much of this content is only played by a fraction of the playerbase when it's new. We also rarely see these gameplay mechanics added to new dungeons either, which is a shame.
Square Enix and Yoshida may choose to continue down this road and that is their choice. However, as a consumer looking from the outside I have to say that the longer these philosophies continue the fountain of new and naive players will begin to run dry. The game will be healthy for many years to come, but it is hard not to see that there is a lot of potential for this game to go from being a good MMO to being great. I just hope that a new "WoW" doesn't come out in the next two years otherwise SE may have the rug swept out from underneath them.
Lastly, if you want to look for something more concrete as evidence that this game is bleeding subscribers at an alarming rate, then you have to look no further than increased occurrences of free login campaigns, particularly since the launch of 3.0. These login campaigns are likely a direct result of dropping subscriptions. It is a common tactic used by businesses in an attempt to bring back old customers. The problem is that if everything remains static there is a slim chance that they decide to become a customer again.