Comment by IggleSniggle

The problem with side projects is that they do not have a well defined goal. Or they do, in which case something like Factorio won't have any appeal because you can just work on something more meaningful instead. Factorio is for people who want to keep programming but are too frustrated or cynical about the real world to do it there. If the real world was better, they would do it there. If the real world could be fixed with programming, they would do it there. Many have tried, only to discover that what they thought were technical problems are really people problems.