This is how you get a search warrant: A person makes an affidavit in front of a neutral and detached magistrate, who then determines that a reasonable person wo

This is how you get a search warrant: A person makes an affidavit in front of a neutral and detached magistrate, who then determines that a reasonable person would conclude that it was more likely than not that incriminating evidence of the named items or persons would be found in the specifically named place to be searched. Lots of legal buzzwords there. Each of those buzzwords adds overheard in obtaining a warrant. Police are happy to avoid that overheard whenever possible. That is the motivation to avoid obtaining search warrants. Plus, a privacy minded judge might deny you. With warrant-requirement-exceptions you don't run the risk of being denied a search. You just do it.