Chelsea was not just lucky they deserved what they achieved since they started very well from the day 1 of the club world cup competition, getting to the finals they proved himself and right and proved everyone who never believed that they could lift the trophy wrong. Enzo Maresca has proven himself in the competition and for next season every team needs to be ready because the league is going to be more competitive.
The only time I can confidently say Chelsea are not so lucky is when they face PSG, they killed that game and spin football around, including me I lost money I bet on them because I had the believe they were going to loss but things went south. However, if this guys face some other club from quarter final, semi final and knockout stage, they will be out before the final but the teams they faced were not up to their standards but they didn't decide that, it was decided by vote from the beginning.
All this looks good and everyone is hailing them now until they make some little mistake or if the season resume fully and they refused to meet up with everyone expectations, that's when you will know that there is no permanent friends and club in football, they will forget all the good part they have done so far and focus energy on the bad side until they see they change their ways and performance, that's how people behaves with teams when they are doing well or change to bad performance.