The international calendar applies worldwide. Everyone went mad at missing one league game to play the World Club Cup last year, they go crazy when the AFCON is held in mid season. What are they going to do if each federation set their own dates, that means more disruption to clubs.
Travelling and playing 3 games per week is normal now at club level, we've done it for several weeks already this season. There's no alternative when our players must play 4 club competitions and fit internationals in as well. When I raised these concerns 6 months ago, I was told that they have just had 3 months off, so they don't need more. There are still 6 months of the season to go, 7 if you include the Euros and Copa America, 9 if you include the Olympics. I think we now see that the current demands are too much for some players to manage.