At this point the particulars of the brewed coffee start to matter. For example, if you grind your beans just before you brew, your grounds are fresher than the grounds in the pod. However the pods are flushed with nitrogen during packaging and the pod is hermetically sealed, so if you ground your beans some time ago, the coffee in the pod might well be effectively less stale than the pre-ground coffee in your jar.
As to losing something in the process, that’s instant coffee :-/
At this point the particulars of the brewed coffee start to matter. For example, if you grind your beans just before you brew, your grounds are fresher than the grounds in the pod. However the pods are flushed with nitrogen during packaging and the pod is hermetically sealed, so if you ground your beans some time ago, the coffee in the pod might well be effectively less stale than the pre-ground coffee in your jar.
As to losing something in the process, that’s instant coffee :-/