I have to speak regarding this.
This is an erroneous statement. Steeping exists because some juice flavors DO change.
Take MBV butterscotch, for example. It's mixed fresh. When I get it, it's a very, very light color. Almost yellow. After 10 to 12 days, it turns a rich, dark, amber hue. This is most likely due to the nicotine being oxidized. The flavor does change. I know, because I've been vaping it for almost 8 months now. Along with countless other juices. Steeping exists because it's real and it works, not because of any "mis-information".
Comparing it to a cocktail is a little off. Comparing it to a nice, thick stew is better. When you cook a stew, you add your meat, your veggies, etc. You let it simmer and cook. The night it's prepared, it's delicious. The next several days, after all the flavors have the chance to intermingle with each other, the flavor is SPECTACULAR.
Bartending and mixing eliquid is most definitely NOT the same thing. Not even the same ballpark. Be careful with your declarative statements. Make sure you have the facts and the experience to back them up.
None of them require steeping if they are done right. Who ever came up with this steeping idea has sure caused a lot of mis-information. Ask yourself this question. When you make a cocktail of vodka and cranberry juice do you need to have the bartender steep it for days before you can drink it? Bartending and mixing e-liquid is the same thing. The biggest problem most make is they throw in the flavoring into the NIC juice, well duh now you have to mix it in heavy liquid. Easy fix, mix the flavoring with either your alcohol or distilled water first then add your glycerin then your NIC. I have written on here how to do it and it involves no steeping.....