Could you clarify this? What problems would you run into just from having the default RNG be secure?

Performance / getting a seed

Why is the default thread_rng from the rand crate a dealbreaker for rust? There are other rngs to choose from rand like `smallrng` that is a small fast unspecified default prng if you don't know what you want even for a prng. If the worst case 300 microseconds of the reseeding ChaCha12 default rng is measurable, then it is your job to make a decision about your random number generator.

I don't think rng seeding has anything to do with the algorithm you choose? Seeding from the os rng is usually what you want even for a prng. If you want to use use the current time there is a `seed_from_u64` if you want.

Seeding from the clock is perfectly appropriate for games, audio / video processing, ect.

Seeding from an entropy source is critical for encryption, but that can take time depending on how it works.

Too late to edit: I meant non-cryptographic use cases

This makes much more sense