Machka, first, I have a great amount of respect for you and value your opinion. Based on the dozens, possibly hundreds, of posts I've read of yours, you sound like you have a ton of knowledge gained from experience. I know I've said in other threads that I respect what you have to say. Given that, I have no idea how it's possible. I'm only conveying my observations from my own experience...

I live in the Pacific Northwest. I ride several days per week, rain or shine, year around. And, anyone who knows the PNW, they know it's wet here more often than not. So, I think it's fair to say over half of my miles (which I know aren't even in the same ballpark as the riding you do) are in the rain/drizzle.

As for short distances, that is relative. Compared to you, yes, my rides are very short. My typical ride is around 10 miles, with the longest being around 35 miles.

As for my Brooks: I have fenders, I use Sno Seal, and cover the saddle when it's raining (for a long time I used a plastic grocery bag, but recently I bought a Jandd cover that works nicely). I have never let them get wet intentionally (other than sweat),