What does `WithReference` do in .NET Aspire, and how is it different from waiting for a resource?

I name resources and endpoints as stable contracts because those names become configuration keys and diagnostic labels. A database reference normally supplies a named connection string, while a project or container endpoint supplies service-discovery configuration. Named endpoints matter when a resource exposes more than one protocol or port. I use only when starting the consumer before the dependency is ready creates noisy failures or invalid initialization; I avoid turning every relationship into a serialized startup chain. Readiness must also be meaningful. A running container is not necessarily a ready database, and a process that opened a port may still be applying initialization. Health checks and wait conditions should describe the capability the dependent service actually requires.