As I already said, which your peanut brain either failed to comprehend or read, the engine was patched in recent years. Hmm, let me put it into a perspective where even the most "special" degenerates can understand it..:
CS 1.6 was patched to a linux engine a few years ago after the game had already, more or less, died out. It completely altered a lot of things with the game, including FPS and its commands. It probably takes an IQ of 70 to Google that, so I can understand why it's hard for you little buddy.
Oh, and those bugs that you mention were all welcomed and integrated into the game and its community.. besides the flashbugs that were banned in almost all competitions. Valve never really gave a shit about patching those until HL2 came out, which saw the ones on dust2 and train get removed and big banners with ads for their games integrated.