If idealism is parsimony it is also intuitionistic or constructivist: whatever is serves coherence, or rather its individual being is its part in coherence. But nobody with any real intuition is an intuitionist, they are a more or less covert Platonist. Idealism is fine when it is punching downwards, against matter or the indiscernible object, but against Platonism it would have to punch up, where it turns out to have almost no force. More simply what is beyond mind, beyond the conspiracy of consciousness is in the subject not the object. This is where you have to let go of metaphysics. Idealism is the most pristine emanation of the metaphysical urge, and so in its way is Platonism. To make terms with super-essential Being or the great void you need a whole other language.