I wonder why they choose 70 as the par?
I prefer 72, it means an even 4 shots per hole and makes things nicer numerically.
Really though, I dont care what they do as long as it is fair to all players. My big concern about increased length on holes is whether it is fair to golfers who dont hit the ball as far. Creative shaping of fairways and use of bunkers and rough can even out a field so all are even.
I have no issue with assistance with club selection as this is something the player could do but the caddie save time. I dont think having another person tell you where to aim is in the spirit of the game. This allows someone who does not possess one of the skills required to succeed to be able to putt successfully. I realise there is more to putting than line selection but it is pretty important
If advice from the crowd was breaking the rules the every time a ball was sunk it would be a penalty, every shot from tee to green is accompanied by "in the hole". I personally dont like advice on the greens by caddies or help with lining up on tees or fairways. To me a caddie should only be able to provide advice the golfer could have written down eg distances.
I personally would not go onto the tee box, but if you think about it this is the best possible area of the course to risk damage to the ground. Even in the unlikely event that your clubs are so heave that they do damage, most people will use a tee so the condition of the ground is not as big a deal.