God you should be a comedian because that was a very hilarious post to read.
Oh wait.
What?
Oh you were serious. OOOKAY.
Just for that I'm going to give you a giant post. You must be happy.
Okay. Exactly what part of FFXI would hold FFXIV back, I mean aside from the fact that the way FFXI was designed as a glorified PS2 emulator thus ultimately holding the game back from the potential of what it COULD've had, but can't.
I mean seriously, FFXI still had a lot of great things that FFXIV could've benefited from.
1. Auction House. Though, personally I'm against it. Market Ward is doing a fine enough job as it is now, but still has room for a lot of improvement. This is just one of the examples. However, in the beginning, Market Ward was completely unbearable and very troublesome, sticking with Auction House originally would've solved a lot of problems initially. However, the Market Wards have evolved to a point where there's no need to waste resource to add an auction house now.
2. Chocobo. Do I really need to say more.
3. Mog House. Again, do I really need to say more?
4. Outpost Warp. This is what the game should've had instead of using Anima warp to outposts. It made more sense this way to me. However, I would like see some sort of a unification between The outpost warp that FFXI had and the current anima warp to camps in place.
5. Airship. See: #2 and #3.
6. Ballista/Brenner PVP event. IMO the only form of PVP that FFXIV should have. Completely optional and completely separate from the game. No rewards out of pvp period. It should only be a recreational thing.
7. Endgame events. It doesn't have to be exactly like what FFXI have, hell it doesn't need to be similar but SE have the right ideas with how a lot of endgame events should be handled and made it fun, Especially events like Salvage, Limbus, and Assaults.
8. Delivery system. See #2, #3, and #5.
9. Search Feature and Party Invites seeking feature. (This one's gonna be a rant.) There exists no known bounds on how much this baffled me in FFXIV. This system worked so well in FFXI, that FFXIV should've kept it for FFXIV in the first place, and probably the one thing that could've solved a number of problems in the first place, or at least made a lot of people happier. I mean come on, It's virtually impossible to count Every. single. Players on how much they disliked having to find people themselves, or how much they disliked having to start a party. This is like the first thing they should be adding ASAP.
10. FFXI's bazaaring system. (Again, incoming rant.) Okay, I know there's a bazaar system in FFXIV, but I find a few things VERY annoying about it. 1) How you can't move when you have the bazaar open, and 2). How you have to be within a certain distance to be able buy items from bazaar. Again, this worked just fine in FFXI, so why change it? Proof concept on the saying "If it's not broken, don't fix it."
11. A fully functional UI layout that are very organized and actually made sense. Again, a unification of what FFXIV currently have and FFXI's UI would do very well. Now, don't get me wrong, there IS a few things I like about it: Being able to move or resizing certain widgets was the one thing (and only) thing I actually liked about it. You should've also been able to pick various backgrounds for it as well.
Seriously, I could go on and on about this, but I'll stop here.
Some features can (and should) be evolved to become even better. FFXI had a LOT of limitation, don't get me wrong, but guess what, it's still going on for 9+ years now,
The bottomline is. This is how FFXI did very well. They kept things simple, and enjoyable for players, but even FFXI had a bad start. I won't get into that.
Even with all these features, it's still not going to be FFXI-2. I just can't even picture it at all.
Sourpuss Summary: (Aka for those that say TL;DR)
The point is, SE should've took the feature of what made FFXI good, improve it, and stick it in FFXIV. THAT's what the issue is, they just completely avoided what FFXI had and tried to invent something new which lead to an insane trainwreck.