The idea of understanding each other with just a "few words" is old-fashioned. Explaining things clearly with words to understand each other has become mainstream today.
こんにちは！
ご質問ありがとうございます。
ご質問について、いくつか言い方が考えられますが、例えば、
The idea of understanding each other with just a "few words" is old-fashioned. Explaining things clearly with words to understand each other has become mainstream today.
とすると、『「ツーカー」で通じる間柄という考え方はもう古い、今はちゃんと言葉で説明して理解しあうというのが主流です。』と表現できます。
参考になれば幸いです。
日本 
