Oh yeah, I'm all about indexers and proxies. nostr:nprofile1qyfhwumn8ghj7ur4wfcxcetsv9njuetn9uq3zamnwvaz7tmwdaehgu3wwa5kuef0qyd8wumn8ghj7urewfsk66ty9enxjct5dfskvtnrdakj7qpql2vyh47mk2p0qlsku7hg0vn29faehy9hy34ygaclpn66ukqp3afq8mwcl2  and I have talked about using signers as proxies, since they already have your key and could sign/decrypt stuff on the way in and out. But these are external services that can be discovered by NIP 89, and selected by the user (even if the client provides a default).