For anyone interested in learning the logical rules that dictate the more confusing parts of Japanese grammar (which were, as others have pointed out, dramatically over-simplified in this article), this is a decent starting point: https://www.tofugu.com/japanese/kobun-reading-introduction/
I've personally been happy with the following books as well:
Bungo Manual: Selected Reference Materials for Students of Classical Japanese
Classical Japanese Reader and Essential Dictionary
Classical Japanese: A Grammar
Many of the confusing rules we have today (i-adjectives vs na-adjectives, different verb conjugation classes, etc.) are subsets of much larger rule-sets from early in the language's written history. Bound particles are probably the most confusing of these rules, which were too convoluted to survive over time, but still inform common usage patterns today.
The Japanese language (particularly its written form) is very young, so it's actually feasible to gain an in-depth understanding of the language's entire history without spending a decade on a doctorate.
I've personally been happy with the following books as well: Bungo Manual: Selected Reference Materials for Students of Classical Japanese Classical Japanese Reader and Essential Dictionary Classical Japanese: A Grammar
Many of the confusing rules we have today (i-adjectives vs na-adjectives, different verb conjugation classes, etc.) are subsets of much larger rule-sets from early in the language's written history. Bound particles are probably the most confusing of these rules, which were too convoluted to survive over time, but still inform common usage patterns today.
The Japanese language (particularly its written form) is very young, so it's actually feasible to gain an in-depth understanding of the language's entire history without spending a decade on a doctorate.