Being able to send money to people with things other than Zaps (I know workarounds already exist but it's more technical users that can utilize those tools).
Discussion
What kind of other things?
Well, I mean for beginners on-Chain Bitcoin but I've seen some tools enable Monero too.
Overall, replacing zaps with something like a https://coindrop.to/ ,BTC Payserver, Bitcart, Bitrequest, or some other type of implementation where people could send different currency types as The Nostr ecosystem grows, and begins to foster Bitcoin Cash, Litecoin, Dash, Zcash, etc. users.
Around Nostr those "other things" are known as 💩-coins