I use a Fumoto on two Subies, and have one for the CX-5. You're talking about a thimble-full of oil in the depression of the oil pan, that the longer Fumoto might block. I let my engines drain for 60 minutes, and they still drip, drip, drip after all that time, with a hot engine. If there's metal chunks in the oil pan, they will drop out on the first drain with the stock oil plug. (But only if they are right next to the drain plug hole. There isn't enough speed of flow an inch or more away to wash a chunk of metal out of the pan). Any chunks created after that point means your engine is going to fail anyway...
I guess it's now normal forum behavior (every forum) for some people to obsess. I see it on equipment review, cycles, photo gear, flashlights, etc. sites.