Simple, everyday tasks such as going to the bank or asking for directions would be very difficult. In fact, giving or receiving information of any kind would be a challenge.
Of course, as intelligent people we would find a way to communicate, but with the possibility of errors in transmission being high. The inability to accurately share knowledge or ideas would have a negative impact on intellectual development. The efficiency of society in general would deteriorate.
Fortunately we have common languages and effective verbal communication is taken for granted. Alas, the same cannot be said about construction processes.
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