That just reeks of "people are idiots and I don't wanna get sued" type ass covering. There's nothing about these machines that's particularly magical. They just aren't stupid proofed against the typical homeowner half-assery. Solution is don't be stupid and don't half ass the install (i.e. read the docs the manufacturer publishes about the machine and do something to mitigate the corners you inevitably need to cut in your specific case).