That's understandable, especially as the effort to make old apps forward compatible isn't being made by the application developer here, but by the platform developer.

Conversely, Microsoft is rather notorious for not making many of its own offerings forward compatible with themselves. For example, old versions of Office cannot open or edit files saved by newer versions. And while new versions of Office will open older format files, they then save the file in the new version of the format by default. This one-way ratchet "strongly encourages" upgrades in lockstep.