Yeah, certainly that organisation has a lot to do with a lot of things. :) But someone has to decide to use that particular style in that project. And nobody really can tell me why. I've heard a very nice therm for that: Cargo Cult Programming.
As for scope prefixes, I'm big fan of Uncle Bob's clean code, and usually, I try to write classes and methods so small, you don't need any prefixes to visually separate things. :)
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