Note that under your interpretation, if a police officer sees someone committing a rape he can't arrest the guy until somebody comes down from the station with a warrant because arrests are "seizures."
No, arrests aren't seizures, and no, a police officer doesn't need a warrant to arrest someone. Constitutionally speaking, they do need a warrant to search and/or seize, just as the 4th amendment stipulates. Or else any government actor can do anything they want along these lines, as long as someone, somewhere, is willing to say "Well, hey, Cletus, that seems reasonable to me." In which case, as I have pointed out previously, there is no reason for the 4th amendment to exist, because it it utterly meaningless under such an interpretation.
The Courts actually have a lengthy list of types of search they consider reasonable.
Yes, the copious malfeasance of our many dishonorable, sophist, oath-violating judges has indeed become well entrenched. But as with slavery, women's rights, the drug war, and a huge host of other things, they are, as they very often are, completely, utterly, and without even the slightest shadow of a doubt, wrong.
Keep in mind I am not talking about what the courts say here. I'm talking about the constitution itself. Which is above the courts, because it defines the government, under which the courts operate. No judge can legitimately say "yeah, but I don't think so, so no." Among (the many) other problems with that is that it is an abject violation of their oath, and as such disqualifies them from holding the position. Of course the reality is that the judges and lawyers have captured the system, and whatever they say goes -- but to claim that this is constitutionally valid is just ridiculous. It's simply the usual banana-republic / despotic rule-making: whatever we say, goes.