This may be above my pay-grade, but if one is a transcendentalist/idealist, then belief in classic cause and effect is incompatible with that belief . . . or one has to significantly qualify what is meant by cause and effect. Many folks who refer to them selves as transcendentalists/idealists are actually dualists, or simply rebranded materialists (I am not suggesting you are)
Regarding the 'illusion' - when you pick up an object, like an apple for example, what does your experience tell you? When I pick up an apple, I see it's color and shape, I feel the texture and if pressed with a fingernail - I can sense the sticky juice, I taste the tart sweetness . . . and I remember apple pies and so forth. My experience of the apple is passionate and lively - Where is the illusion? Toss in more awareness and all you get is more passion - there is no illusion. 'Illusion' is just India of old - we don't need no stinking illusion in the 21st century.