Earlier quoted context omitted.
Yes but as OP pointed out, that requires you (or them) to spec it all out. And if you do, that’s how it works, and that’s probably exactly what happened when you buy any well-made product that was designed in America and built in China. But a whole lot of manufacturing relies on the OEM not just for the production but also some of the engineering. They probably don’t communicate to you all of the little parts you did…
> They probably don’t communicate to you all of the little parts you didn’t spec because they don’t think you want them to. And yet, every single time I've seen reports of people having trouble with manufacturing, this was one of the problems. Someone presumably had to figure out all the little parts, so send the result of the figuring out before manufacturing begins ! I'm not trying to oversimplify, here. There are…
So you’d have to spend electrical engineering salary on checking over every little wire. That adds to cost and timeline.
Part of what you use the OEM for is so that they have to spec it out, not your expensive engineers, and get something lower cost and faster.
And frankly, a lot of things you just don’t expect that you have to tell them. Like the wire length issue in this particular post, you would expect them to just get that at least approximately correct.
You don’t know what you don’t know and it’s easy to evaluate in hindsight, but what you’re not seeing in this post is all the things they just did correctly with no prompting. There were surely very many, and each of them saved a good amount of time and money.