Yes, if relays could relay then the system would be perfect
But as for IP addresses, I personally would never consider browsing the internet without a VPN. Without a VPN, every single website you visit has your IP address. And your connection provider knows every single website you visit.
On iPhone at least, installing a VPN is very easy. The problem is that not all traffic will be routed through it (only regular browsing activity). Therefore, the only reliable way to stay safe would be to avoid using a sim card on your phone and to connect only by wired / wifi to a VPN router connected to a dongle. Which all requires power, storage, and... friction.
It's cool that certain mobile apps such as BlueWallet have TOR bundled in... so perhaps the main nostr relay that people hang out on can expose an onion hidden service at some point.
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