One of the best parts: Time will tell how effective each campaign manages to turn data, analytics, ads, and fundraising dollars into actual votes on Election Day
These can not be cheap to print and deliver, and as such they are an enormous waste of money; money that could be used to educate/inform/persuade voters who are undecided or registered with a different political party.
I wonder if a thousand years from now, archeologists digging tough landfills will see a 4-year-periodically-repeating-layer (like a geological sedimentary layer) of these mailings and wonder "what was that all about?"