The problem is it's unlikely Primal will ever be able to transition away from their caching servers as they are central to how Primal is built

Nymble's architecture will be able deliver better performance in the short term leveraging BitDNS (ie. Namecoin) as the discovery mechanism for the relays. Initially the settings point to servers hosted by Nymble [Nymble relays will be smart] but at any moment people will be able to redirect traffic to their own servers with zero loss to UX

The Nymble offering will be unique in another MORE important way: people will be able to keep a complete and permanent record of all their notes. Their entire history of contributions to the Nostr ecosystem (whatever the user wants to show) will be on full display at a decentralized webpage found at [yourNAME].bit

** .bit has been around almost as long as Bitcoin and is secured by Bitcoin hash via mergemining.  Refer to BitDNS or Namecoin for more information.

From here we're a stone's throw away from being able to access whatever information we need without tradeoffs to security or UX AND have the ability to better lure influencers from all disciplines/tastes with the promise of being able to monetize their following directly according to what the market is willing to pay.

The future looks pretty amazing guys...