Would you rather have the model encounter the internet for the first time once is been deployed?
You don't test a bullet proof vest with rubber bullets. Also, all these arguments about the sandbox being too weak are good in hindsight anyway.
> You don't test a bullet proof vest with rubber bullets.
You also don't test with live humans wearing the vest.
Hindsight for some, not for everyone https://marc.info/?l=openbsd-misc&m=119318909016582