[kassner]

But you can’t download them anymore. And if you need a new app, you also can’t download an older version that would work on your device.

Not to mention apps (usually banking apps) that plainly refuse to work if you aren’t running the last version.

[Schiendelman]

What you're describing is a choice by the developer of the application. There are several applications I use where users are directed to download a new app instead of forcing a breaking update.