What we know is that high salary/high potential young players (21-25yo) are retiring, while they wouldn't have in the previous system. Also, since we can't see other manager's players, we will never be able to assess:
a)what TSP is needed for FA at every age/potential combination
b) if there are differences between a player fired and a player in a botified team
This is just impossible because nobody is able to gather the data. This isn't like a GS or Training Speed project.
Also nobody can stop Marin from changing the rules to his liking without notice, since he has kept them secret to everyone else, including the GMs as it's becoming evident. This is not even a matter of trust in Marin, it's just that if he changes the parameters nobody will ever know!
Whether you like this situation or not is up to you :?