"there is always some guy who thinks he knows better" ... typical and expected.
My advice was clear: "If you need a tie-down, use whichever of these methods works best for you and gives the least offense." The rest was plainly labeled as what I would do and what I have done. Not advice. There is no one-size-fits-all. I "car-top" on a truck with a wide span between bars, or carry on a trailer with similar span and no means of fore and aft tie downs. There is no movement on the crossbars. Yes, a rack could fail, just as a deck with a hole drilled in it could fail. We could tie down, tie front and back, superglue the gunwales to the bars and wrap the whole thing - racks, bars and vehicle - in shrink-wrap, but each of us has to draw the line somewhere. Apparently one person's decades without trouble is "better" than another person's decades without trouble.
I thought these forums were for discussion so I added my thoughts, never patronizing, condescending or arrogant, and I don't think I was (like "if that's the best workmanship you can muster up", "next time you should practice a bit more before you start drilling" or "perhaps some better tools and practice on some scrap wood might be a good idea before trying it on a boat" or "there is always some guy who thinks he knows better"... wow!).