I'm not being a white knight here. I am just speaking my mind and my thoughts on what you posted.

1) Microtransactions in general, in a Pay 2 Play game

I do admit having an ingame option to obtain it would be a wise PR move. No arguments here. However, it's been an FF MMO practise to have these. FF XI had them too. Thankfully however, non was ever close to being a game breaking addition.

2) The Pay 2 Win Aspect

Pretty sure there's a limit to how many retainers you can have. So it's not like you can buy 100 retainers and make A x 100 (materials) whilst u sleep. Frankly speaking if any, I'd purchase them for more storage because god knows 2 retainers + 100 slots isn't enough. I can gain just as much mats in less time as per comparison too. At best it's a novelty of convenience. I don't see why this would impact the game at all.