**nothing** authorized to be in the commercial cockpit is cheap. Also the older aircraft cant fit or power or integrate new ‘stuff’ easily. And the FAA hasnt certified, because no one has asked the to, or spent the money for testing, etc etc
Like trying to upgrade the cockpit of an F-14 (think TopGun Maverick) to the glass cockpit and gizmos of an F-35B — aint going to happen, aint gonna work anyways.
As a private pilot/ general aviation you have more leeway in using a handheld Garmin or even your smartphone for VFR navigation, but it’s not going to integrate into your 16 year old Cessna 182.
“*nothing** authorized to be in the commercial cockpit is cheap.”
No doubt that’s true. In cars, the self-driving equipment is certainly of high quality because wrecks caused by its malfunction will be costly. But it’s not that expensive.
My daughter had a car with driver-assist option. She got a rear fender dent in a parking lot, but the repair was very expensive because a sensor was knocked out of alignment, and the checking and re-alignment was a big job, so said the repair shop.