Okay so firstly, I said within 12 hours, I don't sit and watch my fermenter with the fridge door open all day.
Second, I never said pure oxygen, there is oxygen in air, and I add oxygen with a sterile filter and pump.
Third, growth phase ("lag") is perfectly normal, I expect some growth in my yeast. In fact I want it.
Pitching rates expect growth in the beer, if you have no growth, you have minimal yeast flavour contribution. I personally pick my yeast strains (yes, both liquid and dry) based on what I want in the brew and pitch according to what growth rate I want.
Fourth, flocculation. Different strains have different levels of flocculation, I've had liquid yeasts that sit at 1 degree for 2 weeks and are still very cloudy. Its not a liquid vs dry thing.
I'm also aging the beer, so its got plenty of time to clear.