Just like the 1911, or the SKS when they were hot a few years back. A bunch of experts crop up, as do a bunch of parts to fix stuff that ain't broken, or to "improve" almost every part of the gun. These "improved" parts usually lead to a loss of function, or reliability issues. Guns like the AR-15, 1911, SKS, S&W DA Revolver, etc., are popular because they are good, strong designes as manufactured. Big difference between tweaking your gun for your specific use (like an ambi safety for a left hander) compared to wholesale parts replacement.
Larry