well you see the powers that be introduced this wonderful concept called 'materiality' into how they have directed the game is to be refereed. The better class of referee, far above my ex-pay grade, sees an offence and then exercises judgement to decide 'was it material?' aka did it make a difference to the play. Thus we can notice an offisde right wing when the ball is kicked through on the left but discount them as not material.
Let's consider this at the static set pieces...
Put in at the scrums; most elite scrums are not contested, the hooker without the put in does not strike, the pack does not attempt to drive the putting in side off the ball, thus the scrum is 'just a restart' as SH officials say, and the crooked feed is not material.
Then we start to see that creeping into line out throwing. Doesn't have to go down the middle anymore but right at your man. The oppo aren;t always competing in the air so it isn't material.
Then the more dynamic aspects of the game....
The ruck, that isn't really a ruck at elite level, but a pile of bodies on the floor. Well the opposition aren't really competing so the fact is the players off their feet are not material... so then we can allow said players off their feet to facilitate the ball back to the scrum-half and their hands in ruck, even after ref has called no hands, are not material.
Then you apply materiality to open play, an intense, and dynamic environment, and by extension of the principle of subjective 'did it make enough of a difference' the elite ref allows all manner of things to slide just as you have listed. Yet nowhere in the Laws of the Game is materiality even mentioned, let alone defined!
The average fan, even the well-versed fan, sees blocks, and late hits, and illegal barges, and players tackled off and without the ball, sees all manner of calumny on the park short of attempted murder. And sees it all go unpunished. And said fan is baffled. Completely. But should said fan query this he will be told "No one pays to hear the referee blow his whistle, they want to see a game of rugby and you clearly don't understand materiality".
A ref down in the weeds, where refs are not encouraged to apply much in the way of materiality but to 'ref what you see in front of you', will have 30 baffled players every Saturday when he pings the crooked feed, etc., etc..