For god sakes, yes. You're overgeneralizing.
What cause mob monopolization was in part the horrific spawn rates yes, but also what effectively lead to window camping.
By no means, what soever should any reasonable person be on call at ungodly hours of the morning just so they can go and farm a mob who has unique Best In Slots - period.
That's artifical difficulty, not ACTUAL difficulty. There was a reason why people 'unmotivated'. The spawn conditions on these monsters were completely unreasonable by any important standard, and defending said system by saying "Oh it's the Casual's fault" is infuriating. - a system that says you have to be at the ready 24-7 for a video game and be willing to spend 12+ hours at on sitting and/or rotate shifts. That is wrong on a humanitarian level - not a question of 'if you're dedicated enough.' You flatly should not have to be dedicated to that point because it is detrimental to real life.
Anything shorter than 3 spawns a day even if it's a minboss placeholder, is horrific standards to have in an MMO, and is what creates these horrible behaviors such as monopolization attempts, harassment and cheating. The HNM scene was nothing less than a hostile, overdrawn, and just generally unfriendly player enviroment. That's why players were unmotivated about it - not because they were simply lazy or 'not good enough', as you're trying to imply.
I can't stress this more, while there can be difficult challenges, the FFXI HNM concept was flawed and toxic to its very roots game wise. And it's my personal opinion that the concept needs to be re-thought from the ground up.
And I am full of the ideas on that topic. Ideas aimed at increasing both fair play, accessibility, and reward yield, while retaining a lot of the tension and difficulty of epic HNM fights. But some of the mechanics I have in mind might not go over well with people, most notedly of them would be a Free-Company Wide Cooldown on claiming a HNM imposed by having to have a specific item used to claim the monster to begin with, that you can only buy so often. This would be offset by the fact that these HNMs would spawn at least three times a day (an 8 hour repop timer would be about the max I feel would be reasonable) with the exception of course of Primals, who would be off the claim list if they're under the control of a Free Company - who would feel the cooldown once their primal is used or their allotted time to use it expires.
That would flat out guarentee that other Companies got their shot, and the cooldown timer (I was thinking 48 hours.) Would still be shorter than those who were waiting 3-5 days for Tiamat to spawn in FFXI. But this way, instead of 'being on call' they can actually focus their time on other aspects of the game (or other aspects of their real life). Or, if they're really into it, go find another HNM to claim.
There's other ideas I've got in mind that are less restrictive and more insentivizing for various play, and a feeling of unity for a Company as a whole. But the above one is defiantly going to rub some players the wrong way.
In the end, the game shouldn't be just 'casual friendly' but even for hardcore, it should still be humanitarian. As I stated before, there should be no desire for foul play in the HNM scene, and that should be reinforced by the mechanics.