BOP is akin to homeowners insurance, in that it has both property and liability coverages. Sometimes the insurer doesn’t even distinguish the loss, and rates it on a single pure premium, and thus a single premium.
CMP in my view, distinguishes the coverages a lot more, sometimes combines what would be several policies into a single policy. Can small businesses buy this? Sure. But if you’re a business owner, BOP is much easier to quote and buy, otherwise you go through the underwriting process for Property, GL, and maybe get some sort of package discount after you combine them, but it’s far too tedious for your small business owner, especially if you’re just one of the thousands of hair salons that basically have the same type of risks.