Pre-filling filters is, IMO, un-necessary. Others prefer to do it. I see and understand the logic of prefilling, but I don't think people consider the alternative concepts. Allow me to explain.
First, look at the obvious advantages to pre-filling a filter (I'm going to ignore the topic of how much time elapsed from fill to use; seconds or months still results in a pre-filled filter). The upside is that the oil pressure reaches all intended parts that much sooner; everyone would agree to that and would see that as a benefit.
Now, let's acknowledge the risk of not pre-filling. Some portion of time (perhaps 5 seconds) of non-pressurized running.
OK - now look at the other size of each condition, as compared to how normal things work.
In pre-filling lube into the filter, where do you pour it? The only practical place is the center hole, which is the OUTPUT of most filters. You are, essentially, pouring unfiltered oil into the out-bound side of the filter. No one I know of tries to overcome the ADBV and put the oil in the outer holes of a filter; which is the "normal" flow path which leads to proper filtration. And yet, so very many people here freak out when they think of the potential of the filter bypass valve opening up temporarily. Hundreds of threads have occured because folks are terrified about the filter bypass valve being overwhelmed, and yet many of those same folks are ignorantly doing the same thing by pre-filling the filter; they are introducing unfiltered oil (and be assured that "new" oil really isn't that clean ...) into the filter in such a way that it will go straight into the engine. Why? So they can have immediate pressure.
And let's examine closer that "pressure" need. Most all folks follow the recommendation to warm the equipment before draining. So, all components are at proper temps, which means the clearances are good. I would like to think that most folks realize when they drain the oil, there is still oil that exists with surface tension in all the lube pathways, along cylinder walls, etc. Unless you let the equipment drain for HOURS, you're not likely to get all the oil out anyway. But, some folks love to let the pan drip, drip, drip in a vain attempt to "get all the old oil out". And then they "pre-fill" a filter so as to send unfiltered oil right into the very engine they are so cautiously trying to protect. Ironic, is it not!
Here's the way I see a reasonable approach to the OCI.
1) Warm the engine (equipment). That makes for good lube flow upon draining, and takes clearances to proper sizing.
2) Shut down, drain pan, and pull filter.
3) Install dry filter while pan drains.
4) As quickly as practical, reinstall drain plug as soon as the drips start; dripping indicates full volume flow is done.
4) Install lube and fire it up.
Even though the engine will have no pressure for a few seconds, there is still plenty of residual oil on the bearing journals and on walls via surface tention, as to provide a slick surface. While not desirable for continued operation, it's certainly not dastardly damaging.
And I would point to the millions of vehicles out there that exhibit great UOAs, even though they don't get "pre-filled". There are some applications where pre-filling cannot take place (many Toyota's use fitlers mounted with the base plate pointed down, after all). And yet those non-pre-filled engines turn in great UOAs. In fact, the UOA evidence suggests over a broad mass market that pre-filling offers no distinct advantage. OTOH, there is no evidence that pre-filling exhibits a risk either.
Pre-filling is a "feel good" practice that neither helps nor hurts. And, the logic supporting that practice is only solid until a reasoned analytical approach is undertaken, and then the reality of data shows it's moot. It neither helps nor hurts.
