Speed is the main reason with my setup. In my case I have Coinos as the default wallet for nostr:npub18m76awca3y37hkvuneavuw6pjj4525fw90necxmadrvjg0sdy6qsngq955 ( via the zap.army workaround ) via NWC. Custodial but very fast. Small amounts only.

My Zeus connects to my core lighting node over TOR. Sovereign but not as fast, not ideal for zaps.

Plus I can quickly connect to the same NWC wallet from any nostr app that supports it if I want to. 😃