>>>>That's all true except that 'sealed move' wasn't invented at Fischer-Spassky time. Actually, it was used all time since official tournaments started, i.e. since 19th century. Currently, it became obsolete because games are not interrupted more, i.e. players are required now to finish game during one playing day. Snail mail play is also extinct. The reason is quite simple: computer age.
>>>
>>>Not completely extinct. I've been playing via mail with a couple of opponents since I was in high school.
>>>
>>>FWIW I'm also an avid CW (morse code) ham operator.
>>>
>>>Some things just don't die.
>>>
>>Do you mean you still play via mail?
>
>Yep. Just a tradition.

I understand, you can play with friends whom you trust. However, official tournaments are not feasible anymore. As it stands now, even regular chess tournaments, without 'sealed moves' (i.e. all games must be finished in the same day) still bring accusations that some players use computers in restrooms, or get correct moves by cellphones, etc., i.e. it becomes technically challenged environment.