Uh OH... incoming diatribe.....
Start with: OP don't bother "fogging" the motor if you've recently been riding the bike. the motor fogs itself... if you don't believe me: get your motor up to temp and remove the oil fill cap. See all that oil rich mist floating out? Engine fog. "Fogging" and engine is for long long term storage and you'd use some real high viscosity glue... yeah don't do that.
Meh sounds like hocus pocus.
Nope. Not something you will notice, but it WILL lose oil pressure sooner. The change is so gradual you won't notice, BUT in the long run your bearings won't last as long. Most people trade on their bikes fast enough it's not an issue, but long term it is. I'm into "old" bikes, so it is very much an issue with ME.
If you did regular oil analysis you'd see it as elevated levels of lead.
It'd be nice to see how much on the PH level oil acidity changes from new to a year later
It is dependent on a bunch of different factors: condition of the rings, the ambient humidity the motor operates in, the ambient temps... blah blah blah... it gets down to blow by and how much water is in the oil... which changes motor to motor, rider to rider. There is only one way to find out: YOU do oil analysis on YOUR oil.
When you change the oil in your motor, you don't get all the old oil out, so after an oil change you end up with a mixture of neutral PH oil and high acid oil... so with NEW oil oil after a year, the acidity would depend on the acidity of the oil you changed out a year ago.
Now here's the kicker: you're supposed to change the oil before storage, so you have low acid oil in the crankcase... OK. Problem being: when you drain the crankcase, you don't drain the oil in the oil passages and on the bearing faces... the oil that is gonna eat the bearing surfaces, so you're NOT really doing it any good UNLESS you turn over the motor, without firing it, to replace the dirty oil on the bearing surfaces with nice clean, neutral PH oil.
Nobody ever mentions THAT part.
I rarely pull plugs and directly inject.
The idea is you want the rings sitting in an excess of clean high detergent oil, hopefully cleaning the ring groove of carbon. Rings usually don't get bathed in oil, they like that