Oh, because of course Eorzea has been completely overrun with Female Viera and Male Hrothgar forever right?
Not just, literally no-one in the Shroud, La Noscea, Thanalan or even Ishgard ever seeing hide nor hair of either of those two races... Until now.
It's literally not that big of a stretch for Male Viera to exist, outside of some stubborn reasoning of "No-one has seent them lul" which also implies that contrary to literally every other race in existence both in game and in real life, that every single Male Viera just blindly accepts their role in society.
Yes, but if other players are cause for you to have issues with lore, then you're playing the wrong genre of game.
This is an MMO, meaning that people will often do things that are contrary to lore. Such as playing a bunch of "Rare" races like Male Miqo'te. Playing characters that are from rare tribes/clans. Playing literally one of a kind never ever seen before except the WoL because they're magical and special jobs.
Or even just using non-immersive names. There's a character on my server called Panty Inspector for example.
With an MMO setting, you have to take things with a grain of salt where other players are concerned. Since, the main thing about an MMO is that you create your own character. Which means everyone is playing as that one in a million special snowflake.
This isn't even a case of removing lore.
This is a case of adding to it.
Or are you going to next complain about how taking over Baelsar's Wall and then leading the Resistance to retake Ala Mhigo is "Removing" the lore surrounding how Ala Mhigan's had been kicked out of their home and cannot return and thus "Destroying" immersion?
Because MMO's are about creating your own character. Even more so in FFXIV where your character is also a literal special snowflake that is given no backstory for the sole purpose of you headcanoning your own.
Plenty of people would be thrilled to write their own fiction about how their Male Viera came to leave the forest and their society and end up arriving in Eorzea as a common adventurer turning into the Warrior of Light.
To say nothing about the extra customization that an additional gender option would provide (To say nothing about couples in real life who would like to have a Viera couple in game, which could come with their own lore that they both decided to run away from the forest because they fell in love with each other)
Only if the lore doesn't evolve. Making it unique among all the lore in the game wherein it and it alone must remain static and never change.