[android-developers] Where do we use uses-feature android:required="false"?

I have a question:

If I wanted to support a feature (says camera) but it is not necessary
(menu item removed if detected no), is it necessary to declare:

<uses-feature android:name="string" android:required="false"/>

I assume we can simply do this without declaring. Isn't it? Or is it
just good practice but not necessary?

PackageManager packageManager = getPackageManager();
if (!
packageManager.hasSystemFeature(PackageManager.FEATURE_CAMERA))
menu.removeItem(R.id.camera);

Thanks!

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