The way I understand it is that Dell and Lenovo make the hardware and they also might have a hand in some firmware and low level software to present a common interface to the operating system but the actual driver and controls is part of windows. The standard precision driver connects to the common interface. That is the idea of the precision touchpad to make one standard interface and gesture set that is part of windows and not a random thing set up by each hardware manufacturer.
I also think that Microsoft has a lot of power and they are the one driving the precision touchpad. It wasn’t the likes of Dell and Lenovo getting together forcing Microsoft to create it. It is a Microsoft initiative and as such Microsoft should drive the whole thing through to a fully working product.
I don’t care who is to blame or who should do what. This is a Microsoft enforced standardisation to Microsoft specification and they should ensure it works. Even if this means that Microsoft include a standard of performance as a condition for the “designed for windows” certification.