Legal Question in Real Estate Law in Illinois

First, perhaps so that it is uniform for everyone, and second, so that there is a better likelihood that if there is a catastrophic loss the actual cash everyone may need to put up, is less, and third, it may be the condominium association insurer that wants this as part of their own arrangements for a variety of reasons, and fourth (off the top of my head) so that the maximum insurance proceeds are available (the higher the deductible the less the proceeds) and for some coverages the cost is incrementally negligible.