Introduction of Haven in the Stronghold vs. Dungeon tournaments.

I don't know how to best solve this, but personally, I really like the Swiss system overall. With a normal tournament progression, this system ensures that players play against opponents of roughly equal strength at all levels.

Now, the question is – how did someone come up with the idea that it's important for players to play against opponents of roughly equal strength during the tournament?
Can't they play enough against roughly equal opponents in regular games, in non-tournament games, by selecting opponents with approximately the same rating? I'll answer right away – they can, I've checked, there's a plus or minus, but overall the system works.