Most homebrew IPAs I drink are oxidized (maybe grin dry hopping maybe not). I agree the risk can easily be mitigated though.
That's been my experience as well, although I think it's most often from open-air transfers. My hoppy beers got a lot better once I started obsessing about oxygen exposure.
And Denny, I completely agree, although of course I'm going to be pedantic about the difference between "theoretical" and "hypothetical".
As modern brewers we get the benefits of centuries of work on best practices in brewing. Knowing why those practices are what they are is always a good thing though.