Remember that in other fields like medicine, finance, academia, and law, getting in involves 5+ years of hoop jumping and commitment signaling that have nothing to do with the final job.
Genuinely curious, knowing nothing about this field: does, for example a neurosurgeon with 15 year of experience, when looking for a new place to work, have to pass surgery "challenges", like doing a lumbar puncture in 15 min on a fake body to prove his experience?
No, because the fact that a neurosurgeon with 15 years of experience is not in jail means they know what they're doing. Not the case for devs unfortunately.