I play rugby ( although at an amateur level, and contact in the women's game is generally less damaging, given the relative weight and height of players).
I've been following this discussion with interest over the past few weeks, and discussing it with male and female player friends.
One of the big issues, I feel, has been the professionalisation of the game since the 1990s and the demise of the 'amateur internationalist': we have seen the game get progressively faster and the hits get bigger, since players became professionals.
Because money is involved, players are bigger, fitter, faster and stronger and consequently, the game has evolved to match. I think this needs looked at in very stringent detail.
However, at amateur club level, I think things have improved exponentially, with much greater focus on safe tackle technique, for example, and much more stringent adherence to head knock/concussion protocols - 'if in doubt, sit them out'.
Compared to when I started playing in the early 2000s, the quality of training and coaching is do much better.