Okay this makes sense many brewers with more experience than I have said always cap on foam. And that bottle conditioning takes care of oxygen (baring horrendously splashing during transfer etc.). Last year I brewed a very hoppy American strong for a competition (honestly, it’s not something I enjoy sipping) I didn’t need to ship it so I packaged it high fill and bottle conditioned refrigerated once enough time passed. Judges were not kind, and tasted oxidation. I’m not positive that they scored my beer since there wasn’t mention of my over fill on the sheet.
Anyway, I sent two of the remaining beers to a comp as a red IPA. Thinking more wiggle room for the grain bill I used. Feed back was a much better as was the score, but still a mention of slight oxidation. I often give my head space a little shot of wine preservation gas. BTW, what the judges thought about this beer did matter. As I said, not a style I like nor really ever drink. Helpful feedback would be appreciated.