When you use the Sanborn bulkhead feed, you still have an external line connected to it so you dont really gain anything in terms of not dumping oil on the tires.
And that’s why the system I bought with my first W2 engine had all the hoses in the pan.
It drove me wild that only half the oil got filtered at any given time. Obviously it all got filtered at some point, but you always had some trash in the bearings.
I can say I never failed a hose or had a fitting leak, but I had a maintainance schedule and I kept it. When I got the thing back to where it wouldn’t kill bearings every couple of runs (if that...sometimes it would get through a burnout and the I could feel it getting a bearing at the tree...I happened enough I could feel it coming and that saved several blocks because the rods stayed on the crank and it saves the pan too) I pulled the pan every 20-25 runs. I eventually went to 100 runs before I pulled the pan, but I was always looking at the hoses, the distribution can and the fittings like a hawk.