The big difference between national tournament vs club tournament is the national identity.
But now in many sports, in many nations many big world organization does not care, they allow nations to direct “buy” player from other nations with nearly zero restriction such as as long as have passport and never played for any nation before.
When watching FIFA World Cup for example, you no longer able to realize which team is France or Germany or England without looking into the shirts. That is no longer the case 20-30 years ago.
In club tournament you always able to see with mixed races players, and when go to national world cup tournament it is absolutely meaningless if see that repeat pattern. Instead I would prefer to see team full white vs full black vs full yellow, etc. (unless that nation are the migrated nation).
Another big issue is allowing “foreign” coaches which is should never been allowed !
