You have problems with your counter-arguments:
- Modern tools make it easier, accelerating your calendar time, but not necessarily the hours spent studying – 2hrs/day over 5 days or 10hrs in one day is still 10hrs. Also, those FSI hours are classroom hours – your personal study time is longer than that.
- That is just an example of a really bad class. I took Japanese class in college and they went through all hiragana in one week (5 hrs) and all katakana the next week (5 hrs).
- The research data always contains a range of hours that correspond to a range of individual talents, so your talent is included. Besides, the point is not the exact hours, but that those hours are far more than for other languages. The hours show that it’s difficult for people who are speakers of western languages. The next easier language category is half the hours, 1100 hrs.
I’m also reacting to your overall tone which seems to be “sure, it takes time, but it can’t be that hard”. This is a premature attitude. Especially for this thread which is about trying to pass JLPT N1 in one year. (Becoming conversational takes less time.)
In life, we all find ways to be successful in one way or another. However, it’s a trap to believe that because you were successful once before, that all future experiences will follow the same pattern or will require the same effort. It’s useful to be a humble learner.
Don’t take my word for it. There’s an entire Japanese learning community here, with a range of talents and a range of experiences. You can ask them about how hard it really is.