The reason people are paranoid about these failing is because a number of them have experienced this problem with the switch.
Hey, ignition switches don't fail often (on other bikes) either. But when it does fail, or if the Brodie relay failed, unlike any of the other relays or switches on the motorcycle, you are up shits creek without a paddle. You either start jury-rigging (if you know how) or you start walking.
Any time you make modifications to the electrical system, even one as well thought out as the Brodie Bypass Relay, that mod is far more apt to fail than the original circuit that went through full design validation and verification. And yet the stock switches are failing. So is it really all that foolish to have a plan in place to back out the modification?
As someone else has already suggested, if this concern seems to be "over the top" to you, then why don't you just quit reading the posts in those thread(s). Why it should bother you so much that other people want to take steps to ensure that they will not be stranded by a known defect is the harder thing to understand.
My, we're sounding a bit grumpy. <_<
If you're going to set up a bypass to the Brodie, what happens if the bypass fails? Maybe you should carry a spare bypass? Or to save you having to make a repair on the road, maybe set up both a bypass and a bypass bypass so that if the bypass fails, the bypass bypass can bypass the bypass?
My point is simply that, having the ignition problem excellently solved by the Brodie harness, it becomes a little silly to now start talking about a "what-if" scenario positing that Brodie's well-designed and crafted fix might theoretically and conceivably itself need a fix. Sort of like discussing how many angels can fit on the end of the bypass. Anything on the bike might catastrophically fail at any given moment. How many spares for how many parts you going to carry? You have a Centech or other fuse-block? If it fails, as is theoretically possible, you will be stranded. You going to carry a spare fuse-block?