Wrong. In exchange for being granted a patent, the "invention" needs to be described in great detail, with all the necessary information, so that others can replicate it (once the patent protection expires).
At least, that's how it is supposed to work.
The patent description must include enough information so the invention as recited in the claims could be replicated. Patent descriptions do not have to disclose details about the supporting/surrounding components of the whole system or platform.
E.g., a patent claiming a method for selecting 5G channels does not need to describe how to build out a 5G network.
There's no requirement that the information in the patent be via beyond replicating the patent.
If the patent can be reproduced via alternate means that are cheaper or faster, those need not be disclosed. In fact the point of a patent is to protect the patent holder from someone finding a cheaper or faster means of reproducing it.