Earlier quoted context omitted.
> On a higher level - how much of an "already seen the algorithm" crapshot are tech interviews? I'd say it is mostly that. Just do thirty to fifty leetcode medium problems (some of them on pen and paper), and you're good to go.
That is really, really not true. An unintelligent engineer will never be able to practice enough to do well on a well-conducted interview at Google. (They could in rare cases do well if all their interviewers pick common problem.)
>will never be able to practice enough to do well on a well-conducted interview
Or in other words a true scotsman interview.
It sounds like you can't bring yourself to write "on an average interview at Google" because you wish they wouldn't pick common interview problems - but they do.
Based on what you just wrote, I'd certainly work through books of "interview questions". Because your phrasing just proved it works, even though ideologically that is not what candidates "should" do.