I have to fundamentally disagree with the premise: Japanese is probably one of the least logical languages on the planet. To wit, it combines the written complexity of Chinese with the spelling inconsistency of English. The one-to-many relationship between a given kanji and its many pronunciations makes it maddeningly difficult, even for native speakers. 生, for example, has at least nine pronunciations. The only way…
You are now talking about the written Japanese language, with all the (real) problems with Kanji, an imported writing system. True enough, but that has little to do with the Japanese language . If you look at verbs, and ignore the rubbish written in most textbooks about "conjugations" (which for the most part aren't conjugations), you'll find one of the most logical and consistent systems on the planet. There are onl…
I mean, fine, if we are going to contrive a comparison where we are only comparing spoken forms, well…English is still going to come out on top, because - exactly as you explained in your edit - its grammar is simple enough that almost anyone can have a go at it. Stick some words together and you’re probably 80% of the way there. That’s not going to be true of any inflected language, even if - as inflected languages go - Japanese is one of the simplest.
Anyway, if we are going purely on grammar and ignoring written forms, Chinese - having almost no grammar at all [citation needed] - is surely the apex of simplicity.