> Prices are entirely hidden

Recent legal changes have made pricing more transparent. In 2020, the federal government issued the "transparency in coverage" final rule under the Federal No Surprises Act. This limited the expenses for emergency care when out-of-network and a few other things, but even more exciting is that hospitals and insurers are now required to publish a comprehensive machine-readable file with ALL items and services. They have to provide all negotiated rates and cash prices for the services and include a display of "shoppable" services in a consumer-friendly format. The machine-readable files are impractical to process yourself for comparison shopping (picture: different formats, horribly de-normalized DB dumps), but many sites and APIs have emerged to scrape them and expose interfaces to do so.