So about maiming, striking and scouting.

[Seddrinth]

It's kind of nice to not have to roll against anyone else for gear though if you play nin or drg.

[Crushnight]

my take is 1st secondary stats 2nd potential o have future jobs added later without reworking too much but right now yes its silly we have 2 jobs with 'unique' sets tailored to them

[GrizzlyTank]

It lets the Devs tailor secondary stats (Crit etc) separately for the melee jobs, as well as keeping those jobs visually distinct for the most part. I know that MNK and SAM look the same, but they both look different to Dragoon etc.
Its not perfect, but it does indeed serve a purpose.

And secondary stats doesn't matter for Tanks, Ranged, Casters and Healer?

It's kind of nice to not have to roll against anyone else for gear though if you play nin or drg.

Which also increases the situations where no one in the party needs it.

[Sylve]

And secondary stats doesn't matter for Tanks, Ranged, Casters and Healer?

Ironically, no not really. The stats all work out the same effect for all 3. While yes, SCH does like crit a whole lot because of CritLo's, WHM gains as much of a benefit by letting Cure 2 crit as often as Adloq for essentially the same eHP (One restores, one prevents, end result = same healing applied). I don't do Savage Raiding, But its my understanding that if the Tank needed a Critlo to survive a Tank buster, something went wrong, lol.

But for a Monk and SAM who naturally get a lot of Skill Speed via their own buffs, So it doesn't need as strong a representation on their gear, while Dragoons who don't get a natural speed buff get more out of the skill speed that exists on their gear. Basically, Diminishing Returns if that makes sense.

Tanks and Casters both utilize all the substats found on their gear generally equally (Though i'd never put it past theorycrafters to determine that one substat is 1.2% more overall dps than another …)
Tanks especially, since their substats mainly give Damage Reductions or positively affect their own sustainability. Crit works for all 3, Clemency crits are great. Inner Beast/SP crits mean more HP, same with DRK and Souleater. Theres no real need to segment Tank gear and apply stats separately.
It all has near equal value and the jobs don't inherently do anything to devalue a substat the way MNK, NIN and SAM do with their Skill Speed buffs.

Materia as it currently stands on our gear is just a way to make very small gains on top of raw ilvl, since you can't stack Materia Melds if the stat you're trying to Meld in already exists to the capacity of that item. It allows for the min/max crowd to squeeze the most out of their gear.

[BillyKaplan]

It's kind of nice to not have to roll against anyone else for gear though if you play nin or drg.

Until you get the fabled 5-DRG raid party. I often saw NINs fight each other to the death while I, the single caster, got away with my loot comfortably. The only ones who are guaranteed no competition in most recent content are tanks, while healers are guaranteed competition in raid environments. Everyone else is up to luck.