So, I've been doing a lot of winemaking reading. Both forums and in books.
I recently read a big benefit of aging in a oak barrel is that it allows just enough oxygen into the barrel for proper oxygenating the wine during the bulk aging process.
In a glass carboy with airlock. I'm guessing that does not happen. The only way I would think to get oxygen to the wine would be popping off the airlock briefly. (though I have no idea how much that would provide (or needed) or how often it would need to be done if that's what it needs) I've also seen where some people don't rack during the bulk aging stage unless they believe it needs it. That would suggest (by ignorant deductive reasoning) that their bulk aging provides no oxygenating of the wine except when it was first put into the carboy.
So, how do you properly oxygenate wine bulk aging in a carboy?