Pls to help explain in humanspeak what is the use case and benefit of NIP-49?

#asknostr

cc nostr:npub18kzz4lkdtc5n729kvfunxuz287uvu9f64ywhjz43ra482t2y5sks0mx5sz 
nostr:npub1fgz3pungsr2quse0fpjuk4c5m8fuyqx2d6a3ddqc4ek92h6hf9ns0mjeck