I don't know why you think it would knock out 95% of the vendors out there. I have used several vendors and the only one that gave me a juice that I was told to steep was a place called mount baker Vapor. The Vape Room was good straight out of the bottle, all six flavors I got. Halo, fantastic. Wicked, pretty good. Vape Dojo, pretty good juice, had a variety flavors for months and they all tasted the same from day one to the last day. Personally I think steeping is just a myth. Juice contains VG, PG, flavoring and nicotine. There's nothing there that would require it to sit for a few weeks before it tastes good, in my humble opinion. My own DIY flavors taste good the second after I make them. I'm just not a big believer in the whole steep mythology.
I kind of agree to an extent. A few days so the flavors can blend together and taste like one? seems reasonable...one month to 3 months like I've seen in some recommendations?? That seems nuts. I've tried maybe 30 juices, so far some do change a little over time but not a huge amount and some don't but I've never really had a bad juice turn good just from steeping.
Sometimes the steeping advice seems like go back and try this crap in a few months and then maybe you won't be so mad that you bought it.