I am genuinely curious about the thinking of people who would so easily give up their rights. Let's suppose this happened on land. The scenario is like this:
You are awakened at 2 AM by sounds in your living room, investigating you discover 4 uniformed Army recruits in flak jackets and carrying automatic weapons. They politely explain they are here on an administrative search, and would like to see that all the code required fire alarms and smoke detectors are in order, that there are no overloaded extension cords in use, and that your tax bill has been properly paid. They explain that they knocked but got no response, but in any case are not required to ask or announce. They troupe through the kitchen, bath, and bedrooms to observe these items (and anything else their eyes might fall upon). The check only takes about 45 minutes, after which they politely say all is in order and have a nice night.
Would you be happy with this, supposing it occurred only once a year or so?
Change "living room" to "cockpit" and "Army recruits" to "CG recruits" and a few very minor details and you have a CG boarding.
The legal rationalizations argued for the CG boardings are even more applicable to houses: the intrusiveness of the search is no different, the likelihood of finding regulation infractions at least as great or greater, the costs less, and the greater public good therefore better served. Further, the frequency of discovery of probable cause for further investigation from this suspicionless search would be higher in houses, you are likely to uncover drugs, illegal aliens, terrorist cells etc. warranting further investigation at a much greater rate.
This is what Article IV was meant to prevent, due to recent memory of it happening at the time. It was not what the revenue cutter act was meant to allow, regardless of how it has become twisted today. That act was meant to collect taxes from commercial shipping crossing boarders.