Steps to reproduce the issue

Use $app->input

Expected result

All works

Actual result

Fatal error

System information (as much as possible)

Having removed the magic method public function __get($name) from AbstractWebApplication it's no longer possible to use $app->input

Is this really intentional?

I think this will carry on a lot of B/C issues with extensions, also in the comment i don't see it clearly specified as to be removed in 6.0

/**
* Magic method to access properties of the application.
*
* @param string $name The name of the property.
*
* @return Input|null A value if the property name is valid, null otherwise.
*
* @SInCE 2.0.0
* @deprecated 3.0 This is a B/C proxy for deprecated read accesses
*/