The increased reporting insight makes a lot of sense..
I think that the seeming increase in injuries like concussions are the result of 2 reasons, both of which are fixable if the league had the will.
1. First is poor technique. Too many players puts themselves in poor tackling positions with their heads down. Many neck and head injuries are caused by poor body position at contact. You with your head and neck "up", it is in the best position to absorb blows.
2. Reduce the size of the players. The huge hits are a simple matter of physics. If you set limits on player sizes, you can significantly reduce the severity of blows.
When I first started playing football in HS, I was a G/LB, so my first favorite players were Jerry Kramer and Fuzzy Thurston. One was 235 the other was 240. 50 years later and I'm banging the drum to have a 340lb man be the Pats RG. A man who probably has LESS fat hanging over his belt, than Fuzzy did back in the day.
In 1971, I was considered a big SS at 6'1, 205 and acceptably fast enough at 4.8. Today that 4.8 number would make me marginally slow for an ILB, and probably too slow to be a pass rusher.
You just have look at the incredible shrinking Matt Light to realize that many of these players are "artificially" bulked up way passed their natural healthy weight. The game itself would actually improve if all the linemen were, say, limited to 280, all the LB's to 240, etc
Just just throwing it out there