Roles for Samurai, Red Mage, Dancer

[Shippuu]

the trouble with samurai as tank, and it was pointed countless time but ignored by some, is...

Your arguments are often ignored or easily dismissed because more often then not they're either weak arguments or actual non-arguments. I'll easily debunk them once again:

- a two hand sword class (like the dark knight)

While both weapons use two hands, they are starkly different in how they appear and how they would be used. The only similarity is that they are both a form of sword. We have White Mage and Black Mage that both use two handed staves/canes. SCH and SMN both use books (though they are a shared base class). Even then, there is no magic rule that says two tanks cannot have similar weapons. Please provide a sourced comment where any developer for FFXIV has said there can never be any (slight) overlap in weapons by jobs in a same role. That's like saying they couldn't add Machinist because it uses a weapon that fires projectiles because Bard already has a weapon that fires projectiles.

This also doesn't rule out a possibility of a dual wielding Samurai concept, of which there is no dual wielding tank available to players.

- based on parry (like dark knight and warrior)

Nowhere is it said it must revolve around parry. It can have an active counter-attack system/skills without being based around parrying or using parry as a stat. Even then, multiple jobs have abilities that increase parry or proc other moves off of a dodge or parry. Just because one job uses it doesn't mean it's "locked out" from being used by another job.
Even if you argue that parrying is part of FF Samurai's identity (Which it isn't, but counter attacking is but can technically be a different mechanic.) It's no different to how people said Dark Knight must have an HP sacrifice mechanic and look how that turned out.

- mostly physical damage (like paladin and warrior)

Dark Knight is also mostly physical damage (Only a few of their moves do magical damage and most of magical ones their primary purpose is not damage). There are bosses/enemies in the game that become immune to, or reflect magical damage that need to be tanked, as a result tanks cannot be locked into doing primarily magical damage without changing mechanics of said bosses and removing that kind of mechanic from ever being used again which is highly unlikely (same concept applies to melee healers as well.)

- wearing heavy armor (like every tank)

How is this in any way an argument AGAINST Samurai being a tank? The fact tanks share a common armor type is intentional for a multitude of reasons and offers plenty of benefits. Future tanks will likely continue to share this armor type. It makes things easier on the devs and provides flexibility for tank players to play multiple tank jobs to keep them playing that role. Introducing tanks that do not wear fending gear would make tank players have to pick and choose which tanks to actively gear, reducing their flexibility and options which could drive them away from tanking which you don't want to do. This is the same reason Red Mage tank is unlikely unless they alter the identity of Red Mage to wear heavy armor.

the point is the samurai as tank is only a skin.... we already have a jobs with 2 hand sword as tank... and one based on parry. what the point to add one more jobs like this? i see more a magic melee tank that will bring novelty and new gameplay to the tank, more than samurai that some want simply because.... they want samurai as tank.

These same arguments can be made directly towards a DPS Samurai as well. We already have combo based DPS etc. We already have 2 handed DPS that does spike damage etc. etc. I've already debunked the magic damage tank above. 2 of the 3 tanks already have emphasis on magical aspects and using MP, so another physical orientated themed one would be fine.

as tank it will bring nothing new to the jobs. when a tank based on a caster can be quite interesting and have a few way to be added. because dark knight is not really a caster tank, is more a bad hybrid with more a melee with a few ability draining him mp... don't make it a caster tank.

Your lack of imagination and narrow view of what a Samurai is or could be is why you cannot possibly see it as anything but a dps. And I won't even start on how a caster tank just isn't feasible, even if it did physical damage with it's "spells".

So in summary, your arguments just don't cut it, as usual.