I'm inclined to agree with a lot of what you've shared here man, Rugby (especially Union), Boxing, MMA, if you get involved in sports like these then you hopefully know what you are getting yourself into, and have to accept injuries and potential health conditions further down the line, it's just gonna be par for the course. Rumour has it MMA is slowly waking up to the idea that it's going to have a legacy of fighters with various issues due to repeated concussions, and worse.

There might be a couple ideas in your post that aren't 100% accurate?

"The practice is actually more dangerous than the matches as it is full on physical contact for 90 minutes against players wanting your position in the team."

World Rugby guidelines dictate 15 minutes full intensity training a week, and another 30 minutes of medium intensity training. How the hell someone decides what those two things are, and draws a line with a pencil i've no idea, the idea of 90 minutes full contact in training is probably not going on everywhere, apart from places that bend the rules.

World Rugby is obviously trying to stop this case from proceeding saying that the sport is a contact sport and protecting players is impossible.

They never officially argued that protecting players is impossible, they really just took a different perspective where they focused on 'duty of care standard' and 'proactive player welfare' and judged those two on what was known scientifically at the time to back up what was offered to players, which seems fair.

Ex players will tell you that this case is a joke

Not convinced that every ex-player would say that, there are a growing number showing up with early-onset dementia, motor neurone disease, Parkinson's and starting to ask questions, not about the players acceptance of being in a contact sport but whether or not world rugby had evidence to support improvements to care and didn't act fast enough.

I do look at the modern game of Rugby Union now and compare it to 20 years ago and the difference is night and day. The ruck management, clear out rules, tackle height interacting with players in the air, the list goes on and a lot of it was made strides to improve payer safety. The trick is getting the balance right so that VAR and the ref don't spend 50% of the game blowing the whistle or stopping play.

Apologies if my reply seems argumentative, not supposed to be, just love a good convo about Rugby man.