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My argument wasn't necessarily tied to the current UK model of inheritance tax.
My argument wasn't necessarily not flippant.
Irrespectively, and perhaps something to consider - Even with inheritance tax, as an inheritor, you are probably always going to be net better off than you were before inheriting something and paying tax on it (notwithstanding edge cases and abject lack of planning).
The opportunity cost on unrealised gains of inheritance tax for those with less to begin with may well be greater, however.
They do have estates worth over £650,000, however...