What's up with Max Level Monsters in Lower Level Areas?

[Iakothm]

Is there any need to do the missions early level though? You do that and you find you can't do many because you reach one too high level. At level 99 though you can knock them all out at once.

to unlock Dragoon you need to have atleast started mission 2-3.

Make 'em yourself, level WHM, SCH or RDM, use the Tome as I said etc...

Silent Oil.
Alchemy (24)
Crystal: Water
Yield: 4
HQ #1: 8
HQ #2: 10
HQ #3: 12
Beeswax x 2
Slime Oil x 1
Alchemy (29)
Crystal: Water
Yield: 2
HQ #1: 4
HQ #2: 6
HQ #3: 8
Olive Oil x 1
Beeswax x 2

Prism Powder
Alchemy (36)
Crystal: Light
Yield: 8
HQ #1: 10
HQ #2: 11
HQ #3: 12
Glass Fiber x 2
Ahriman Lens x 1
Alchemy (41)
Crystal: Light
Yield: 6
HQ #1: 8
HQ #2: 10
HQ #3: 12
Artificial Lens x 1
Glass Fiber x 2
Alchemy (41)
Crystal: Light
Yield: 12
Trituration x 1
Triturator x 1
Glass Fiber x 4
Artificial Lens x

What New person is gonna have the money / skill level for this? Also Explain to me how to handle true sight/sound monsters please when you can't stealth/sneak yourself past them and can't handle fighting them.