School is designed for many reasons. Not only to learn the material necessary for your job, but to learn the building blocks leading up to your job, to further enhance your education in every facet of life, and to stimulate critical thinking skills. They also show that you can do a task that is required of you; come to class, study, and pass tests.
You could just go to a job, but not all jobs are the best to do this with. If you don't know how to operate the equipment or what your job entails (such as researching), then you'll be slowing the company down with your constant questioning.
Sometimes it really is best to learn about something before jumping into it. Although reading how to do something and actually doing it physically are completely two different things, sometimes having the knowledge lodged somewhere in the brain can help the problem be solved.
This is very true. FFXI isn't real life, and it doesn't require an education in to enjoy. It's a video game. Lots of people before us have been kind enough to parse the information and record to the mass; we should be wise to read up their findings and follow their advice.
I've always said that bad players will be bad players because it's a mind set, not a lack of skill. If someone doesn't care to study the job they're playing at least a little bit (whether it be through trial and error of their own testing or reading online), then that's lazy.
But to be fair I'm not always a good player myself. I really don't care to learn much about White Mage. I'm not a fanatic on gearing it up to be the best. I leveled it for emergency healing for group activities only. If someone points out a piece of gear I should fetch I'll usually shrug my shoulders, unless it's a big change in what I have now. If it's advice on Job Abilities/Spells though, I'm all ears.
When it comes to Black Mage and Summoner, on the other hand, I love these jobs enough to do as much research as I can. Also to obtain as much gear as I can.
When it comes to someone leeching, initially of course I feel kind of put off by it. I had leveled 7 jobs to 75 on my Elvaan the old fashioned way, and soloing. It was slow and sometimes it infuriates me to see other people take two days to get that job to 90 with gear better than I had ever had. Maybe jealousy? Ah, either way, I remind myself that in the end it really doesn't matter; they're level 90 now, and that's all that really matters. That job can come out and help us at events now. As long as they know how to use it, I'm happy.