The Fall of Beacon did, but Pyrrha's death did nothing for it.

The Fall of Beacon changed the tone in no small part because of Pyrrha's death and without it the entire scene would have been completely different, so no it wasn't pointless.

show that has already resurrected multiple people

Who exactly? Ozma is a divine curse, Salem never actually died she was just made immortal and Penny is permadead now and was only revived due to being a robot, so no, a normal human isn't coming back, especially since the only one who did the first two, aka the Brother Gods, have f**ked off and probably don't care enough to revive some random student. What about Adam? Or Roman? Or literally any other death besides Ozma who are now dead for good?

How do you figure that when the holy books of most real world religions include resurrection, and their entire point of delivering messages?

Because the ones coming back are literal Gods like Jesus while Pyrrha is a human. If Pyrrha were say a divine being than yes I would be fine with her coming back but since she's an everyday person it kind of hurts whatever story your trying to give when characters can come back at any time no worse for wear.

There are so many things that matter - most things in fiction or reality - that matter with no regard to death.

Sure they do, but without showing how mortal humans are it is much harder to relate to them.

This isn't Game of Thrones nor a show with a similar tone, it doesn't need to follow the same themes. I'd say it can't in fact considering how central a theme hope is in RWBY and how utterly devoid of it GoT is.

Strange thematic reading of a fantasy book series aside I was making a point that resurrection needs to have costs, drawbacks and messages or else it is pointless fanservice (Ozma has all of those things). Besides, hope doesn't equal someone coming back, and considering a larger theme is people moving on from death those points are contradictory.