Everyone when they first start mixing is a mix and vape after a shake. In time you'll end up putting a mix away you didn't like fresh, find it a month later and think it's the best thing since salad shooter.
The same reason everyone first trying to rebuild with cotton will fill the tank think it looks wet and burn the cotton not giving the proper time for absorption so the cotton provides the capillary action needed for wicking.
Both are factors of the same thing... impatients...
The reason for steeping changing the flavor is how the flavoring reacts when mixed into a soluble solution. When freshly mixed all of the ingredients aren't completely done mingling their molecules yet.
Some ingredients don't need steeping at all like really fruity flavors. Others like tobacco, carmel, vanilla, and more robust flavors need steeping the longest. That is unless you seed steep

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