So when i reach to grab my water bottle with my right (dominant) hand I still can brake quickly with my left.

Which is of course a load of rubbish.

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No scales on the trails

Brake calipers are laid out for left=front. Even thinking about switching is only an issue in non-cycling countries like the US & UK...

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my plastic bikes, 29ers & stable of old steel

I wish that wasn't true!!

Oh that is so last week.

My interest was more along the lines of cable performance and function. I think I will keep the setup the same as I have as I'm sure bad things would happen to me (a night time raid by the Campy police perhaps leading to possable injury or even death for failure to use the method discribed in the official Campy instruction guide?).

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WW Velocipedist Gargantuan

But left=front is about cable performance and function; having the front brake cable enter the front caliper from the left side ensures a nice gentle curve whereas a tight bent is required when operating the front brake from the right (=wrong) lever. The same applies to the rear brake cable. The rear brake cable stops are on the left side of the top tube, resulting in a gentle curve from the right lever.

The Specialized Tarmac SL is an exception, having the first rear brake cable stop on the right side of the top tube. This results in bad front cable routing for right=front as well as an awkward bend in the rear brake cable for right=rear. Obviously a design flaw. But then again, aren't they American?

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my plastic bikes, 29ers & stable of old steel

Well, not exactly. At the braking limit only the front brake matters because the rear wheel is unweighted, all the weight being on the front wheel. So for maximum braking force the rear brake is irrelevant.

It doesn't matter so much nowadays, but I always had my front brake on the left for one reason alone and that was because of downtube shifters. It was impossible to change gear and brake at the same time using your right hand.

Now with Ergo and STI it's not so important. The idea that you have your strongest hand as for the brake is erroneous at best. The way brakes work nowadays are better than they have ever been.

I still have my front break on the left.

Indeed - that's exactly why I changed mine round back when I was a teenager.

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No scales on the trails