Reading the default setting in the #NimbleRPG #ttrpg book today and I was impressed that:

- it has one at all; many RPGs don't even come with an adventure, or maybe just a tiny one;
- it's designed to teach someone new to sandbox play how to do that. The setting is made up of hooks and there are several short adventures if players expressed an interest in an area - both usable and also examples. If you've only read 1-20 campaigns you would have no examples of writing for your own game.