Is it neccasary, what's that all about anyway? Shouldn't a
juice be good right off?
Here's a link to all the questions on steeping in the ask the vets forum. Differing opinions. I do it with one PV - but it isn't 'steeping' as it would normally be defined. It is on my 'coffee' PV and I drip - 2 drops of Doppio Espresso, 2 BWB Espresso, 2 BWB Cappuccino and now 1 or 2 drops of BWB Cafe Mocha. I take a few hits to 'set' it and then let it sit a while to blend. Tastes better after a while but I think it's more of the ejuices blending than any oxidation but perhaps some. I've tried steeping on all my regular ejuices and I prefer them 'fresh'. So I don't do it but hey - tastes are subjective from individual to individual.
Like I've said before it's not wine. And there is a completely different reason behind letting an old wine 'breathe' before drinking it. It also isn't tea in hot water dissolving it's flavors in the heat of the H2O. Again - you'll get differing opinions and the best thing for that is to try it out yourself and don't fool yourself one way or the other - if it tastes better go for it. If it doesn't, don't do it. If you don't know, leave it at that and don't take one side or another because it's a trend or to buck the trend. When it's your judgement alone it's as objective as it can be with your senses and reality.