1. Nope, it penalises the 'attacking' team too much when the vageries of a bounce/pitch divots/swirling winds can mean the ball pulling up way short of the try line or bouncing miles over for similar power/directioned kicks.
Trying to put back rotation on a ball to hold it up and get distance over 35-40m is extremely difficult without having a player charging you down if no.2 gets the go-ahead
2. So if a defender charges down, the ball goes back toward the attackers goal line 25m and they recover it on the last, isn't the risk for open kicking massively more riskier. Will we be seeing the offside rule tightened up because that will just be a joke situation with some teams already infringing the 10 by a few yards, more so at the back end of a game..
3. Again, if we see defending teams being offside at scrums as has been the case for like forever with virtual impunity having an extra man over won't make a huge amount of difference.
Stop the defending team from moving up so quick, as in enforce the offside rule properly, retiring back the required distance behind the scrum until the ball is out and they'll be space for teams to attack, no need to have an extra loose man.