Usage of Traditional style characters vs Simplified Chinese characters adopted in Kanji


As I started peeking into Japanese, I see lots of characters in `hiragana` and
`kanji` where the latter uses Chinese characters that are similar to
traditional Chinese ones (I'm familiar with `hanzi`).

For example, for the following `kanji` 関門 there's a simplified `hanzi`: 关门
(I'm not talking about meaning here, just characters).

Also, country in Japanese 国 is same character in Chinese ( **simplified** ) as
opposed to Traditional 國.

AFAIK in Chinese, people hardly write using traditional style characters,
since they are hard to use. Is it applicable to Japanese? Or is the use of
hiragana/katakana eases that difficulty or it isn't an issue for Japanese?




Japanese doesn't use [simplified Chinese
characters](https://en.wikipedia.org/wiki/Simplified_Chinese_characters). They
use their own system of simplification called
[_Shinjitai_](https://en.wikipedia.org/wiki/Shinjitai)
([新字体](https://ja.wikipedia.org/wiki/%E6%96%B0%E5%AD%97%E4%BD%93)) instead.

_Shinjitai_ only applies to the Jōyō Kanji 常用漢字 while simplified Chinese
applies to _"all"_ Han characters. Sometimes the simplified character is the
same in both systems such as 国, sometimes Japanese version is simpler like 仏
vs 佛 in Chinese. But most of the time the Chinese version would be simpler
than Japanese version

