I’m not sure what you mean by “it looks like scripting.” You can’t judge whether a feature is available via scripting or not based on the user interface. Airtable’s developers have created similarly-designed UI components for both the scripting extension and custom extensions because they want Airtable’s UI elements to have a consistent look and feel. However, that similarity doesn’t mean that all features of one environment are available in the other. User interfaces created via custom extensions can be designed in much more complex ways compared to the VERY few options that are possible via the “input” scripting mechanism in a scripting extension. Please trust me on this. I’ve worked extensively with both, so this isn’t something that I’m guessing about.
The ability to open the expanded view of a record isn’t possible in a scripting extension. The closest that you can get via a scripting extension would be to have the script output a URL (via markdown) that, when clicked, will open that expanded record view in a new browser tab. The only way to have that expanded record view open in the same tab is via a custom extension (I added this recently to a custom extension for work).
