Whilst your concerns are valid, to say it’s not a Nostr client I think’s unfair.
You could make the argument the other way with Blastr relays.
The caching server is clearly an area that could come under fire with pressures for censorship etc but it does improve the performance and feel of navigating Nostr.
Do you think having multiple caching servers to choose from could combat any concerns?
Note, I’m not for or against any method by the way (I use Amethyst, and Primal daily) I just think these are healthy conversations.