Well, yeah, there does have to be a public mailing list.
My point was that there are often public mailing lists, where engineers with real engineering problems could discuss those problems with the engineers responsible for the product/service; and yet the engineer with the problem nevertheless doesn't even think of using the mailing list to reach out, but instead decides to go through regular customer-service support channels to get their problem solved.
My point was that there are often public mailing lists, where engineers with real engineering problems could discuss those problems with the engineers responsible for the product/service; and yet the engineer with the problem nevertheless doesn't even think of using the mailing list to reach out, but instead decides to go through regular customer-service support channels to get their problem solved.