LOL, calling someone casual when you don't have the faintest idea of what parsing can provide you with. Parsing is not only for competing with yourself, unless you are one of the best players out there already and know that what you have been doing is flawless, there's always more to learn from other people's parses. Parsing can help you understand why someone is outdpsing you not just because of gear difference. Parsing can tell you about rotation, damage distribution of skills, and a whole lot more.
Also, you started your thread by arguing that gear swapping is common in RPGs, many people have come and asked you how come the it's not common in the RPGs they've played, yet you never answered their questions. If you want a legitimate reason for why people do not want gear swapping, you should at least give a legitimate reason for wanting gear swapping, since your initial reasons aren't legitimate at all.
You say that gear swapping is "beneficial for SE". In what way? I didn't know that you run or own SE, how can you tell that one mechanism from one of their games is beneficial for the entire company or not?
You say gear swapping is "beneficial for the world's economy". I imagine what you mean by this is that low level gear will still be in demand for high levels due to its unique stats. I argue the opposite, the way gear swapping create low level gear demand is extremely unfriendly for starters, and that will be a terrible way to "help" the economy. You will have people at high level quitting through time, yet the game is unable to recruit more new blood to fill up the economy, just how exactly is this beneficial?
What would be beneficial for the game's economy will be allowing a system where you can take risks and combine two lower level materias for a chance at getting a higher level one. This way you create a system that effectively removes low level or unwanted gear from the system. This way the low level gear market/pricing stays relatively friendly for starters, while you don't end up with a massive overstock of low level gears, and since low level gear materialize faster, it's also an efficient way to gamble for higher level materia in the long run.
At last, you say that gear swapping is "beneficial to the game play". just exactly who's opinions are you basing this on? I sure hope it's not your own, because that's called bias. Obviously plenty of people here in this thread already argued that it isn't "beneficial" to their game play. This argument is simply a matter of preference, so your opinion of gear swapping being more beneficial to the game play isn't any more valid than another John Doe's opinion of gear swapping isn't more beneficial to the game play.
So please, do enlighten me on your "legitimate" reasons for why gear swapping is necessary for this game.