The disadvantage of writing calligraphy is the reason why writing calligraphy is useless.

Founder: It is very useful, because calligraphy is the way for ancient people to convey information. Without calligraphy, there would be no technology today. Did they have a tape recorder then? They are all recorded in calligraphy.

Counterparty: it's useless, because even if you know calligraphy, it's insignificant in the current technology. Are you still writing letters and passing books by flying pigeons in a hurry? By that time, everything will be delayed, so it is better to make a phone call.