I don’t feel like her using lightsabers takes away from Luke, any more than Ben using a lightsaber in the cantina takes away from Vader showing up later.

This episode introduced Din to the concept of the Jedi, as well as serving as a warning to what they could be. This is Din getting a glimpse of what could become Grogu’s future. That’s fairly significant. Her reluctance to help and her prowess in battle feed into that insight. It all gives Din a choice of whether this is the path he wants for Grogu or not.