I'm sorry but making this change during the season without giving the teams the option to make changes after they see how it works (less than a week before the B3 and BBM playoffs) is a bad decision imo.
Personally, my team is ready for it, I have very good subs and it could actually help me against other teams with a short roster. But doing it like that without giving us time to adapt and learn how it even works? I don't like it at all.
Regarding the training of older players, i would prefer if it would hurt the ability of the player, even a lot, but don't actively take him out and make him lose training minutes. I have a 30 yo with 9 stamina that was out for rest after 37 minutes today. Came back later to finish with 42 minutes. I would love him to stay and play badly but just get those training minutes.
And i think here too it's mostly the fact that people are building their long term strategies for years, and then you just change the rules without a proper notice. I don't think it was ever clear that 27+ yo player won't be able to get 48 mins in a game. Was it even intended?
Thank you for your work trying to get the game better, it is very appricieted. But please take into consideration the issues and challenges of those changes. And pleaae - a proper notice of the changes and all of it's implications could have been great.