well the zou zou mou zou and other movement glitches are a glitches and not intentend movement
but about the rest all dogtags easter eggs and other stuff this is developers work time that needs to be paid
and the more money spent on the actual game means less money left for the CEO bonus
but to be fair thats not just BF of EA problem there are a noticeable downgrade in most games quality over the past years the developers just make games for money and simply stoped thinking about the actual gamers
thats just the new reality we should accept or quit gaming because as long as people buys the game and their **bleep** battle passes nothng will change