Oh I absolutely want it to be separate, for the same reason that people want their signer to be separate.
But since I already have a password manager it means it is not an extra app. Using a signer app would mean doubling the number of nostr apps on my phone.
Again, if I use a dozen different nostr clients and wanted them to all use the same account, I'd be all over having a signer. Different software for different use cases.