The Illinois Supreme Court issued decisions in four civil cases last week and granted a petition for leave to appeal in one more. These cases cover important issues across the spectrum of civil litigation.The most important, however, is the decision in Acuity v. MI Homes of Chicago, LLC, 2023 IL 129087, which might be the most impactful Illinois insurance coverage decision since Employers Ins. of Wausau v. Ehlco Liquidating Trust, 186 Ill.2d 127 (1999), which established the estoppel doctrine.In Acuity, the Illinois high …