I have not seen any comments on these subjects: it would be necessary to add faults and penalties in the mauls and the scrums (not only in the rucks) because it is also the reality of rugby, when the scrums or the mauls are too pressed, they collapse and that's the penalty, but leaving the rule of the advantage with the mauls, this must be possible without changing the gameplay too much.
Once a maul is created you should be able to rotate the players (remove them and add them throughout the ruck)for the good continuity of your ruck, and not add them at the start of the ruck and then just push, it makes more real.
we should also increase the number of yellow or red cards against the player and not just against the IA.
Players' tiredness should also be increased and impacted on performance and the risk of injury (as in RLL4), with an obligation to change.
In career mode possibility to go up or down depending on the results.
The penalties are too easy, it would take a system similar to that of RLL4( or make it more difficult).
It would also have been necessary to include a system of passes as in RLL4 by choosing the player to whom we want to pass the ball (first / second / third or fourth player),and not a pass of 50 meters especially made by a forward, it is more difficult but it is more exciting.
Add a stadium creator( always as in RLL4), because you have included fewer stadium than in RC3( I do not why ?).