Can we have a Male Healer and a Female Tank?

[Eloah]

but even if we don't mention human history then it's still the same, Rdm and even blue mage in final fanatsy have always been males at least the most ones just like how whm have always been female in final fanatsy, so i would place rdm in male category

Again that's not it. But you are a bit mistaken. The first ever named WHM in the series was in FFII, a man named Minwu, Terra from FFVI, and to a degree Celes as well, are "RDMs", Celes is usually known as a Rune Knight, but Terra is referred to as a RDM in multiple promotional media. Quistis from FFVIII is well known for her Blue Magic, and Quina from IX might count, even though the sex is ambiguous; though the game tends to treat them more as a girl than boy.

And in regards to what this topic is referencing. The FFXIV RDM is a female miqo'te. The artwork, not the quest giver.