I and a few others are actively trying to change this! There was really no reason for clients to implement nip-46 because there were no great nip-46 signing options for iOS. Nostur works great with Clave and i started contributing to the project as well in order to make things smoother.
i hope to see more major clients adopt nip-46 but they need to hear feedback from their users, otherwise there's no reason to expect it will change. For web try
@noStrudel ,
@Coracle ,
@primal web version,
@Jumble or JANK
https://jank.army. Jumble works well as a PWA on your iphone too. Enjoy, and constructive feedback always welcomed!