I don't get the fixation on player weights.
Physics.....If a 95kg player hits you at 30km/h, vs a 110kg player hitting you at 30km/h, you will understand "the fixation".
What nonsense. If the player was a homogenous rubber cube and you were a brick wall then yes, it's all about mass and velocity.
But people aren't built like this. For starters the weight is not evenly distributed over the body. Secondly, there are the individual physics of limbs and body parts. If a 110 kg player hits me at 30 km/h on his gonads or his skull, he's going to be the worse off.
Thirdly, point of collision matters, i.e. technique. Trevor Gillmeister had a playing weight of about 90 kg but used to kill blokes in defence, because that is about technique and not pure weight. Georgie Rose was often playing at over 120 kg, and decently effective at times, but was no hitman enforcer iron shoulders. And what was Georgie Rose's top speed anyway? 30 km/h is a 12-second 100m.
Lastly weight is not power. 110 kg pure exercised muscle is not the same as 110 kg of flabby muscle or 110 kg of lard. Imagine slamming into me at 30 km/h with 110kg of jelly, and I'd probably burst straight through it. But certainly don't throw a 110 kg brick at me.