There are so many things going on in a game of rugby that it's difficult for a referee to see everything. Yes, some things are blatantly let go seemingly nowadays. The vast majority of scrums are 'fed', which is illegal. Also true that many line out throws are not straight. Some do get called, others not.
There has always been a disparity in interpretation between northern and Southern Hemisphere referees. It's nothing new.
Binding on the arm on the opposite side to the ref really winds me up. Literally 90% of the time its done, why the touch judge never calls it i have no idea.