Should programming languages use cryptographic rngs like a ChaCha20 based one in their standard libraries to stop accidental use of non cryptographic rngs for cryptographic purposes? 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.
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.