Why did the Tournament System change from the old system of awarding points based on how a team finished in a particular pool/tournament?
The main purpose of the Tournament system is for seeding tournaments. Since teams tended to play within their divisions, there was no way of knowing whether a Silver team with 70 points was better than a Gold team with 40 points, for example. This uncertainty makes it difficult for (a) teams to be placed in the correct division and (b) fair pools to be created for tournaments.