When I was first getting my equipment for wine making I found some drilled rubber bungs from a scientific supply site. HUGE MISTAKE. The rubber bung imparted a heavy rubber odor to the air in the carboy and possibly to the wine itself. As a result I no longer use ANY rubber products with my wine making - the alcohol and acid contend of the wine does not mix well with some rubber varities and my plastic carboy cap for my airlocks seal just fine.
Periodically I check the solution in the airlock and use a spare airlock filled with fresh sanitizer to replace a cloudy or low level airlock. Exposure to air is so minimal in the second or two it takes to swap the airlocks.
As to aging in a bottle or in bulk. Hey if that wine is perfectly clear and doesn't drop any sediment fine. But once you've taken the time, energy and materials to bottle - any late dropping sediment is going to sorta ruin the looks of that wine even if it does nothing to the taste.
The concerns about O2 exposure seem a bit over the top here. If you rack properly then there should be no splashing. Those who use a vacuum pump for racking are already lowering the exposure by pulling out the O2 and in fact degassing the incoming wine.
Whatever works for you but again this seems like a debate that nobody wins except those selling more and more supplies to the folks taking extraordinary steps.