No manuals
That's what makes the forum so valuable!
I recall back in the early eighties when we'd by a new HP mini- computer at work, it would come with about 20 large binders crammed with technical information on every aspect of the hardware and software; a significant investment of time and money by the seller, but vastly increasing the ability of users to interface and build on the original system.
Those were the days... now you by a tablet that comes in a plastic bag and no instructions to tell you how to turn it on. We get great prices now, though. Before the internet, finding info was brutal, and providing it with products essential. Now, not so much.