Yeah I get your point although it makes lots of sense for every team including the winner to participate in the qualifications round and merit their way through effort into the next tournament but then winning the previous tournament is enough to get them in just like it's done in the Champions League. But Fifa has made their decision and the winner would have to work hard to participate again in the next tournament.
Maybe because this competition is held every 4 years and follows the world cup competition between countries so the rules must be the same, I don't mind even though the rules are quite burdensome for the current edition's winner because they have to fight again through the UCL competition to be able to participate again in the next edition, there are still 4 UCL seasons for Chelsea to collect points and that is quite a long time.