> But that comes at the cost of speed
That is mostly a myth.
I mean... technically, yes. But the cost is so marginal that you will have a hard time even measuring it unless you generate gigabytes of data.
For pretty much all common use cases like generation of ids, tokens, etc., you can use a secure random number generator and it will not impact your performance in any meaningful way.
It's also the exact same silly argument as for the memory unsafety.
Incorrect isn't faster, it's just wrong, I can have wrong instantly and you're not faster than that, or smaller, or cheaper, or easier to understand. So you're just much worse.