That moment when you get back into your project (as you're dogfooding it), and wonder how to extend it, and then see that you build an indexer that does EXACTLY what you needed.
public Entity this[int index] => new(_world, _identities[index]);
And it, even though it causes API bloat, makes a confusing API much more convenient downstream.
Worth it.
I was always on the fence about basically duplicating the API surface for all Queries, but it makes much sense.