Yeah, but we have practically usable variants of meltdown and spectre. the only reason its not useful to deploy them is due to a massive amount of herd immunit

Yeah, but we have practically usable variants of meltdown and spectre. the only reason its not useful to deploy them is due to a massive amount of herd immunity (and the fact you consume a lot of CPU when trying the attack making it clear - bad combo for an attacker)