This is a good point and I'll be honest I didn't actually take the time to read in detail the 5 pages of backstory they had/have on lodestone. And I also got rushed through all my cutscenes for darkhold and ifrit (i actually didn't even get to see Ifrit Jr cause my buddy killed it before my CS ended, haha).
But this still doesn't explain how they are completely ignoring the Factions, Leves and the gear that came from them. Factions where a new idea, and the fact they had leves you had to do in a certain order to get to the best "special missions" (even though it was only 2, it was still a progression) gave incentive for players to party with others to keep getting more faction points as well as leveling new jobs. The point being they need to do these two things better, make old content still worth doing, and still worth helping, as well as making the gear useful.
This is probably your best point, it's true you wouldn't see warriors flipping out of their breeches in mid combat. And this i completely agree on, my point i was trying to make though is in XI you were given the chance to change gear but without delay and without any form of hesitation on your characters final movment. This wasn't really my biggest point I was trying to make, and even though I miss being able to change gear on the fly, I can understand why it should be done away with, people should be prepared before entering combat it just makes better sense. The point was without the ability to change gears midfight, it eliminates a small portion of why people would want multiple kinds of gear sets. Making horizontal development slightly more difficult to maintain.
Hold it right there buster, I never said I wanted anything to be 'easier', in fact when I learned the lv 25 dungeons were uncapped, I was rather disappointed I was hoping they would have been tough similar to the Promies of CoP in FFXI, but not only were they uncapped, they weren't even required to enter the next dungeon. You could just skip them all together, and honestly who needs lv 25 gear when you're only at lv 25 - 35 for less than 2 hours. I literally only put on R40+ gear now while i'm am being power leveled. This causes two issues among players; first, players never learn the job or how it is properly used in a party, and second it completely makes using any gear not lv 40+ worthless. Which makes it extremely difficult for new players to get going. Also, who does leves anymore? The exp per hour is so low it's not even worth bothering, another thing that went to the waste side.
I have no idea what you were talking about with the seals and marks, but if you're saying all I want to do is make gil off them you couldn't be more wrong. I wouldn't pay seals to buy any of that gear they sell, the most valuable item sold via the Grand Companies are the manuals, which help with exp via DotH and DotL. Some of the gear can be materialized and a few of the food purchases aren't bad but I wouldn't use seals to sell gear.
As for the marks, I like the effort it took to obtain all of my different abilities, but sure enough I will have 30,000+ built up that I can't do anything with. At least with the crafting jobs you can exchange them for crystals but with how difficult it is to break crystals now it maybe easier to just go farm shards to craft with. (this is likely a temporary issue, i'm sure SE will make Fine Sand easier to obtain/make later on, or the moraines) But for my ARC and LNC jobs that have excessive marks, SE has plans to do away with them entirely, exchanging them for gil which will probably be unequivalent to time spent obtaining them. (Don't ask me why i have all these marks, I know they are useless now I just kept getting them instead of gil for rewards.)
Do you have any family or friends you have shared accounts with? Have you never wanted to help a friend get something while they are away or visa versa? It's as simple as that, I have many friends with children who play and they support their kids characters using separate machines, which is fine to SE because it's not done on the same machine. But what is the big difference if one person is controlling two accounts with two terminals versus one person controlling two accounts with one terminal. If people want to dual-box they are going to do it anyways, there is no reason to inhibit this use.