Windows Phone has a "My Apps" / "Your Apps" section which is used for reference...

[Quote Microsoft]
"It is by design and it is not possible to remove the app history. It is used for your reference, the apps that you have uninstalled, so that you can install them in the future, if you require it."
[Quote]

Now it dose not help having this section if you have apps that you no longer wont/need/require and with the passing of time more and more users are going to get larager and larger "My Apps" section...

The user should have the option to remove Apps they no longer wont/need/require!