Monk absolutely does need major fixes because the devs should be ashamed that Stormblood Monk ever existed in its current form.
Monk continues to lack a huge amount of basic parts of its kit that most other jobs have. It doesn't get a ranged GCD at low levels for single mob pulls. Monk's mobility is terrible, easily the worst of the Melee. We only have one mobility cooldown and we have to use it on cooldown to deal our maximum damage. Ninja and Samurai never have to use their gap closers to achieve Max Damage. Dragoon, while it does need to use its jumps to achieve Max Damage and to build eyes for Life of the Dragon, also has Elusive Jump which allows a great amount of Free Movement at no cost. Monk doesn't have an AOE chakra dump, so we have to dump Forbidden Chakras on single targets in AOE situations. Monk didn't just get a new ability to maintain it's stacks where Black Mage and Dragoon got that utility added to old actions, it's new action is actually worse than the reworked old actions. Black Mage can maintain Enochian indefinitely with Transpose, Dragoon can literally just add 15 seconds to its much longer Blood of the Dragon timer when ever it wants. For Riddle of Earth to work Monk has to get hit, so we can't control our refresh time ourself. It's also on such a long cooldown that if two mechanics that require a GL3 refresh happen back to back Monk is just shit out of luck (Third boss of Rabanstre). Coupled with how GL3 is incredibly short means we can and often do end up losing our stacks before we actually take the hit outside of one fight where it's reliable. Perfect Balance's cooldown is stupid. There's no reason for it to be 3 minutes long when equivalent abilities are on 30 second cooldowns. Our Aggro generation is insane and while Diversion is useful in limiting it, it's cooldown is too long to be effective, we could very much use an aggro 1/2 Skill. And that doesn't even begin to get into changes that Monk has been waiting on for a long time that it should have gotten in Stormblood that it just didn't get with the action rework.