They'll be reintroduced under a new name in a decade or two with endless self-congratulation. Same as physical car controls.

Here's a solution off the top of my head: have a dedicate "info" button at the OS level. Holding the button disables normal interaction, highlights all inspectable elements, and allows you to click on each one for a description. Like "inspect element" in the browser.

IMO the main takeaway is that malformed input is not an exceptional state when parsing, and should be treated as a first class citizen. Everything else is yak shaving how you want to handle the (status, validObject) tuple coming from the parser.