Well, it comes across as a defence for Square Enix, but it's really a defence for MMO developers in general.
First you have to understand is that those MMOs have investors.
Investors are people outside of the company who put forward money as capital towards a new release to try and make it "The next big things", this money can be used for;
> Development
> Servers
> Wages
> Marketing
You name it, whatever is needed. The big issue with that is the investors want their money back ASAP. Hence why you see F2P/P2P/P2W games coming up all over the place, they want their money back as soon as possible so the developer resorts to adding in cash-cow mechanics.
Square Enix does NOT have investors, after the original failure of FFXIV any money put into FFXIVs development was done so frugaly and with great care.
All of the money spent is from Square Enix own pocket as a risk and wager in the hope that ARR would be more popular.
This game relies almost entirely on its subscribers to fund it's future developmen, maintenance and even profit for the company to develop/produce other content comes from FFXIV.
Thinking for even a second that all of your subscription goes back into FFXIV's development is just foolish, it's thrown into to pot and then split.
So vice-versa, other content produced by Square Enix that turns a profit goes back into FFXIV also.
Why does this matter?
Investing in servers where they weren't needed was one unnecessary cost they decided to avoid.
All unnessecary risks, dangers and costs were avoided from start to finish, which is why FFXIV is one of the most accessible and 'safest' MMOs on the market currently to play.
That's my suggestion yes, not as a "SE are supreme, you're a scrub!" menatality, but a genuine effort to help.
Square Enix or any company for that matter cannot and will not guarantee that your connection to their game will be flawless, there are just too many factors that they cannot influence or change to guarantee that, which is why it falls on you to do your best to either bully your ISP into trying to fix it, or finding a work around.
That's all that can be done really, Square Enix dumping an EU datacentre somewhere in Germany will not fix a terrible connection and I can guarantee even then that people will still have issues if not the exact same ones.
THAT BEING SAID. There are some people who would genuinely benefit from an EU datacentre, but the cost is still a bigger factor to Square Enix which is why you've never heard them even mention an EU based EU datacentre.