> The real problem of Japanese is the massive amount of homophones coming from Chinese
So you're saying that verbal communication doesn't work in Japan and everyone just texts each other? "I'm sorry Mr Honda Kawasaki but due to how Japanese language works it's impossible for me to tell whether you want to buy three oranges or cook prostate cancer, please send me a letter" "Okay I will fight the sky colander"
Most countries at some point had to simplify their languages in order to promote literacy. Korea didn't ditch hanja just for shits and giggles, it did so in order to make it easier for schools. Japan never really had to face this problem at a scale that required complete removal of kanji because by the time people got such ideas Japan was already quite literate, so kanji stuck around. Plus, Japan is an extremely conservative society, they only ever change anything once all other options have been exhausted.
Same reason why English spelling is so ridiculous. It's not that English is such a unique language that it absolutely requires a spelling system that doesn't make sense and effectively forces everyone to memorize each word's spelling aside from it's pronounciation (wow just like kanji), it's just that English spelling has never been a problem to a degree that required a systematic solution, so now we're stuck with what we have. If we suddenly decided to make a giant reform of English spelling to have it reflect actual pronounciation, the resistance would be equally giant.