I'm sure the end of Visual Basic (before the .NET impostor) was as much of a big if not bigger deal for many people as HyperCard. :p
The discontinuation of many of those things personally affected or disappointed me at the time. I distinctly remember mourning some of them:
- Losing people who only ever used Comic Chat and didn't make the migration to other services.
- The end of offline Encarta at a time when my internet wasn't very cheap, fast or reliable.
- Owning some great PC joysticks but not being able to utilize their full haptic features with newer APIs, before the joysticks themselves went out of production, when Microsoft's console division cannibalized their PC gaming division.
- A cool vector graphics editor [0] that worked better for me than Adobe or Corel getting discontinued after 2 versions.
The point of this whole thread is developer confidence, and I have felt betrayed and abandoned by Microsoft many times but I have yet to experience that during my time on Apple platforms.
Apple's current APIs are impressive and very forward-looking, and the only times I felt that optimistic about Microsoft was just before they broke their promises.
Cool link by the way, I hadn't known of Jim Woodring before today!
[0] https://en.wikipedia.org/wiki/Microsoft_PhotoDraw