Then it's not a nostr client, it's just a platform using a relay as a message bus. I think a pure nostr client can roughly be defined by ones ability to run your own instance and still have comparable or full functionality.
Example:
When I run my own NostrBnB I still get storage (blossom), compute (contextvm) and auth by having an architecture that allows these things.
I speculate that price pressure will incentivise exactly that. Specialized actors offering their services on a free market for sats.