What are the disadvantages of a paper based system?

Disadvantages of paper based communication:

There are many benefits towards this communication method but they always come at a cost!
Issues arise as cost of sending away Via. stamps and delivery, other areas are the writers hand writing quality along with the grammar and spelling mistakes.

Some paper based methods do occasionally result in typed up letters printed off and sent away but these letters can include typo's, other mistakes, Etc.

Also when you send away a letter to another destination there is always the issue of the time taken to deliver it as it can take among weeks to even months on delivery and many times, the letter is either damaged or returned which can be again a huge issue!

Hope this short explanation is helpful