Another reason is that, as a pilot, I want to see and orient myself to the airport as I know it from the approach plate. I use everything from runway heading to the presence of parallel runways to confirm my orientation, position, etc. It's my job to know that there are parallel runways out there, and my job to orient myself to the correct one. I would rather have them both lit up as visibly as possible so I can satisfy myself that I'm in the correct position, rather than have my mental image expecting two parallel runways, and when I roll out on final, I only see a single one lit up. I want ALL the information available for me to confirm my position matches what I'm cleared for, including selection of the correct parallel.
Now, I'll freely admit, I only fly dinky planes for fun - "real" pilots, feel free to set me straight as to what you prefer.
most foreign pilots follow the lead ins, see A RUNWAY, and assume that must be it.
Really? Wow. They don't use heading to confirm, or confirm that they're on the correct parallel, or.... Not that it hasn't happened before, as you assert, but you're not giving "foreign pilots" much credit here...