Modern Japanese is a chimera of native words, Chinese, Pali, and various European languages. Kanji are used to write the Chinese loanwords, hiregana for the indigenous stuff, and katakana and Romaji for the European loanwords (sort of). You could write everything in hiregana, or even in katakana or Romaji with some effort, but doing it this way is easier.
Most languages are, it’s just that Europe had the benefit of latin being really dominant. We’re super lucky here we just latinized all the Greek and Hebrew, instead of writing them in their own alphabet.
Modern Japanese is a chimera of native words, Chinese, Pali, and various European languages. Kanji are used to write the Chinese loanwords, hiregana for the indigenous stuff, and katakana and Romaji for the European loanwords (sort of). You could write everything in hiregana, or even in katakana or Romaji with some effort, but doing it this way is easier.
Most languages are, it’s just that Europe had the benefit of latin being really dominant. We’re super lucky here we just latinized all the Greek and Hebrew, instead of writing them in their own alphabet.