SilvertearRen, I understand you.
I, too, am a casual-gamer and can't waste many hours on waiting for a particular spawn.
However, I find NMs roaming the world are quite nice to see too. I know many "hardcore' gamers like it that way too.
One good compromise would be to have both options available: one free roaming NM with a non-exclusive drop, one instanced-NM with an exclusive drop (much like Valkrum Emperor in FFXI who dropped Empress Hairpin/Emperor Hairpin depending on where you would fight it... except, reversed). That way, the on-demand NM prevent flooding of the market with the rare item, while the one that spawns in the wild can be a proud achievement for hardcore gamers.

The problem is, Final Fantasy has both casual and hardcore gamers, pleasing both of them is quite difficult.
But yes, they should go the extra mile to please both type of gamers with solutions like I stated above.

Oh! One more thing, shouting and saying profanities won't help any thread get more attention than it truly deserves.
Have a nice day!