Why I need more retainer

[Shioban]

Unlocking future classes on your character paying 2$/month to increase the cap on the armory system if you already had the current 19 unlocked could be considered an optional service too. Yet I don't think that anyone would be OK with that.

Because this is an optional service.
It's not providing any advantage to the gameplay. (Un-like your strange Armoury System comparison would)
It's not gating you from any of the in-game content. (By gating I mean, "Pay $2 to access this part of the game!")

It's there as an; "Oh you want more space for items...well you're going to pay per-month for the extra data then"
Seeing as Retainers will be MUCH more valuable come 2.2 with Retainer Ventures this is one of the many reasons why you're going to pay for it.

Lots of questions, I know, but if I ever tried to recommend the game to anyone after we got the two retainers implemented for an additional monthy sub... I wouldn't be able to answer any of them without looking like an idiot.

Paying for Extra Storage is perfectly normal.
It shouldn't even come up in topic when recommending the game, how would you even bring that up.

"Wow, and you get to fight all these old game bosses, and there's all these classes and jobs. BUT YOU WON'T WANT TO PLAY, YOU HAVE TO PAY FOR EXTRA STORAGE!"

If you're jaded enough to focus on the small detail of one optional service from an MMO that's completley subscription based and offers no P2W, by telling your friends "ITS A BAD GAME, THEY MAKE YOU PAY FOR MORE OPTIONAL ITEM STORAGE!!!"
You're going to get laughed at.

How can people defend this when, if this wasn't this way, everyone would benefit? Do people really think that the cost of those two retainers is even a 0.1% of those 2$ and that they don't get enough profits from our subs to cover that? And what about a lot of the other issues that should be covered by our subs, like servers (lag and disconnections on certain days, delay, EU having its servers across the pond, etc.), that should be fixed before even daring to try to charge for other things?.

1.
This is an optional service.
This is a game here to make money.
You don't HAVE to pay for it, that's why it's OPTIONAL.
Anyone who buys this won't be getting any real advantage to the game beside being able to horde more items.

2.
Your 'lag/disconnection' problems are almost always an issue between You > ISP > Montreal (Where the servers are located).
I play in Europe, I have friends playing in Australia who have no lag issues. STOP immediatley pinning the blame on Square Enix, when it's most likely a node between You > Them causing the issue.

Unless the vast majority are having connection issues, it's not their fault.

3.
Your subscription pays for;
The saved data you keep on the server. (A lot of players can eat this data up fast, hence why extra retainers will have a fee for the extra stress)
The bandwidth of data you transfer between you > server > you (This gets expensive rather quickly)
Game Development. (Patches 2.2 > 2.3 > Expansion are ALL being developed with your subscription, that's what keeps the game going)