Just had a realization re: #gamedev. Especially as I get older w/a wonderful family, I have less time for games. Getting on and playing at same time with friends is near impossible.
BUT! (and MMOs have this) the ability to multiplay async is possible. Crafting and sending items to help your friends, etc. (Note: I am not talking about turns sitting in a notification somewhere.)
Designing a game with lots of ways players can async play together is a critical element.