This has nothing to do with multiplayer games vs. single player titles. This has everything to do with the margin of error afforded - the margin of error that others can pick up on their own.
I'll put it this way; if I'm playing a team-based FPS and one of my teammates sucks, it doesn't mean that I lose every round. If I'm in an end-game alliance in FFXI and a person or two is derpish, we can still pull off victory in the vast majority of cases. FFXIV is the only multiplayer title that I've ever played featuring such all-or-nothing content - either everyone is decent-to-good, or everyone loses. That is, I repeat, horrible, horrible game design.
In fact, in direct response to you, Edli - in the current system, the team's performance doesn't matter in the slightest. What matters in most groups is solely the performance of the one person who makes the first mistake. The team overall can be playing at a very high level, but one person who slips up generally causes a wipe anyway.
Anyway, TL;DR - assuming that XIV's uniquely harsh end-game design is the only way (or even a good way) to implement team-based gameplay is absolutely laughable. Your comments were not remotely constructive, nor were they particularly valid from a rational standpoint.
It's not an issue of three months; we're talking about T5 being a barrier still for many. My underlying point is that, if you lack a static party, end-game content is rather unpleasant at the moment for most people. This is largely due to the fact that PF and DF are unreliable, require lots of time, frequently result in hostilities or drama between party members, and certainly make for a stressful experience rather than a fun one (for me, at least; and I suspect this holds true for most others using them). That's not to say doing end-game content without a static is impossible - it's not. It's to say that doing is a fairly miserable experience, with sources of difficulty and stress coming more from finding a working party than the content itself. That's a problem, in my eyes - a serious one.
Also, considering you are not a member of a static by your own admission, I think you reinforced my point that most people who can routinely do 8-man content in statics don't have lives. Just saying.
Finally, my comment about 16-player sizes would clearly necessitate a redesign of fight mechanics to account for the extra bodies. I didn't mention this explicitly because it would become completely obvious were this course ever pursued.