Checking if an ear is affected by earwax / infection / foreign body can be carried out by a nurse, who doesn't need nearly as much education. This is besides the fact that audiologists don't typically deal with earwax / infections / foreign bodies anyway, and typically refer to an ENT anyway. Even after regulation which only permits the sale of the physical equipment which would pair with your smartphone after a prescription from an ENT who sees no sign of other problems, it would still drastically reduce costs for the end consumer, who would never need to set foot in an audiology office.

And pediatric hearing loss is a fraction of all hearing loss patients... don't make the perfect the enemy of the good ;)