Question on DefaultFormRenderer

Hi,
Question about DefaultFormRenderer. This is on more places, but one example:

public function renderControl(Nette\Forms\Control $control): Html

After accepting parameter of Nette\Forms\Control, quite a lot methods, which are NOT defined in Nette\Forms\Control, are used. It's these:

$control->getOption(...);
$control->setOption(...);
$control->getForm(...);
$control->isRequired(...);
$control->getLabel(...);
$control->getControl(...);
$control->hasErrors(...);

My questions:
1)Why there is not used Nette\Forms\Controls\BaseControl instead of Nette\Forms\Control? BaseControl have all these methods needed by renderer.
2)Why PHPStorm is OK with it and not yelling on me (as usually :D) something like “method ‘getOption’ not found in Nette\Forms\Control”?