When I started out with this stuff, dinosaurs roamed the earth and steeping meant letting a juice sit for a spell away from sunlight. Some one asked about leaving the bottle open while steeping and somehow that lead to airing out, which is oxidizing and evaporating, became the same thing and this was spread far and wide among the newbies. As newbies become vets, they still spread this misconception as they don't question where the knowledge comes from.
I question everything and investigate. This is why I've destroyed numerous attys playing with flavorings that should never see a vaporizer coil. This is why I tried steeping, leaving a sealed bottle sit, and I've tried airing, which is leaving a bottle sit open. What I discovered was most juices don't need steeping and don't change with steeping. One recipe was made better with airing while quite a few were made worse. Tobaccos usually need steeping and airing them makes them harsher and more bitter. (this might be good for some folks, but if I need harsh and bitter I can do that with flavoring and increase the complexity at the same time)
So a few recipes were helped by steeping and I use that.
One was helped by airing and I use that for the one recipe.
Most don't need a darn thing and I don't bother with any of it with them.
When I make a new recipe and I get close, it is shoved aside to let it steep to see what happens, then I adjust if it needs it. Sometimes I'll try airing, but I still only have that one recipe that is helped by that and I cannot find anything else to make it taste perfect.
So on this sub I try to make sure that folks keep the two separate and encourage everyone to try any, and all, methods to find what works for them. If we confuse the two, well, it becomes impossible for anyone else to understand what is going on.