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the fear that most users won’t run their own nodes, with the assumption that running a lightning node means a dedicated always-on server

Indeed, most users won't run a dedicated always-on server. That's not fear, that's obvious.

And consequently a fear of centralisation over time.

Breez and Phoenix are centralized, no? Non-custodial though, which is great. But do we want LN to have just 2 big nodes (ok 3, WoS too)?

user funds are secure?

User funds are secure.