"pre-professional days fitness levels were lower"
Of course they were. Players went to work on Monday morning after the match on Saturday. The image of Nigel O Hara on the left hand side of the 25 coming up from a ruck and the play transferring over to the right and him with his hands on his knees shooing them away will never leave my memories of the game. Players were also lighter, wingers at 12 stone. Backrow at 14 stone. With fitness levels they were also slower (well the forwards were). More line breaks in the amateur game? Well they didn't lead to more tries. I would say there are much more tries scored today than before. There has to be, we're paying £100 a ticket, rather than a fiver and lifting your son over the turn stile.
With professionalism, players trained 4-5 days a week, after training bulked up in the gym. I am trying to think about one club, I played at that had a gym, let alone a weights area. Only in the professional era in the late 90's. So players got fitter, bigger and faster. The danger levels in the game raised because of it and eventually the game recognised that it couldn't be played with the rules of the amateur era. Thinking back to rule changes, I think lineouts began to change with lifting. It's a foggy time as I went from backrow to frontrow to ensure the lads got a game on a Saturday. That hastened my retirement, fed up of not seeing anything other than the pavement til Tuesday!
I can remember a certain Northern Neanderthal wailing and gnashing of teeth when the scrummaging laws changed, then were tweaked and tweaked to where we are in a position today where scrummaging looks good at this world cup. They also look as safe as they can get. Barnes control of the scrums particularly impressed me. Players and refs are singing from the same song sheet. There was a certain amount of trial and error to get to that point. The same is inevitably going to happen with tackling. We can be critical of the what's happening at the moment, or we can gruff and grumble. What's the alternative? The game stops for a season for players and refs "to get things right".
One thing I've noticed this world cup is that the offside rule is being zealously adhered too. Is this to ensure that the defender has time to make a legitimate tackle? If so good, but the zealous attitude on the goal line, giving penalties for finger tips over the line is going overboard. It's one of the reasons we were critical of Wales not being given a second yellow against Fiji the other week.