There are risks and there are benefits. Managing the risks to get the benefits is the game.
My sites only use cookies for user preferences preferences and client-linked session tokens, so I am not too worried.
A different way to mitigate the risks is by only storing information that does not need to be private, remaining small and un-interesting, designing for transparency and auditability, and keeping a close eye on those audit logs.
There are risks and there are benefits. Managing the risks to get the benefits is the game.
My sites only use cookies for user preferences preferences and client-linked session tokens, so I am not too worried.
A different way to mitigate the risks is by only storing information that does not need to be private, remaining small and un-interesting, designing for transparency and auditability, and keeping a close eye on those audit logs.