It's a special case of a more general trend: the complete abandonment of what were once called RAD (rapid application development) tools.

Microsoft also killed WYSIWYG Visual Basic (pre-dotnet), quite possibly the most productive GUI builder ever made. Not quite as clean as hypercard, but another example of that bygone era when the user was the customer and not the product.

The only remaining representative of that era is the spreadsheet, and it seems pretty solidly locked in. Still I do see a push to replace spreadsheets with opaque SaaS tools that do specific things.