I don't care what people say, saying that SPV nodes are less secure than full nodes (in a network with significant minority of honest miners and honest relays) is absurd.
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Full nodes entirely rely on a sufficiently connected network with enough honest miners and relays to have any hope of invalidating payments in real time... If SPV client saw the same headers the full nodes see, then they can opt to validating competing forks, at least they should always fully validate any reorgs... So what are they missing now? Nothing.
Autism in moderation is all I am saying.