If you ask "why care about email when normal mail works just as fine" then "because you always get it quicker" is a much better answer for "well there are edge

If you ask "why care about email when normal mail works just as fine" then "because you always get it quicker" is a much better answer for "well there are edge cases where an unbanked person might actually have access to a local cryptocurrency speculator offering them spendable cash for less commission than Western Union or the local hawala service"