Not at all. Difficulty stack-sitting is typically not due to the wedge, but rather because the body may need time and guidance to learn the technique.
We recommend trying the wedge upside down, which provides a gentler forward tilt, this can make stacksitting more accessible early on.
Additionally, learning and practicing stretchsitting and stretchlying first can help prepare your spine and pelvis for stack-sitting success.
? Resources to help you get started: