The perverse part is that people who are supposed to protect the rights of the Alaskans are instead actively working to deny them those rights, while hiding behind the flimsy excuse of "separation of state". It's definitely not what the founders envisioned - the "commerce clause" - the reason-to-go for every federal power expansion now - was meant to prevent trade bareers between states, not to allow the Feds to suppress state decisions under the guise of "oh, it might influence the price of marijuana in other states, so it's commerce, so we can do whatever we want". Calling this "precisely what the founders envisioned" is just laughable.

All it takes is you sending a picture postcard using the US Postal Service during your 'crime' to make it a federal thing.

This sort of hack to elevate crimes to federal level has been abused plenty of drugs cases in the past, so that separation of state and federal powers is mostly a matter of decorum, if the feds want to be involved in a case they will be.

How is it a "hack" for the federal government to assert jurisdiction over a crime that involved the use of a federal service?

The postal service being used within a state should not make a non-federal crime a federal crime. "Not crossing state lines" versus "using a service that could be used to cross state lines".