Carlos
im reading that its a lot of people asking to return to lvl 30.... why? its any problem?
Because for accounts that were Level 30 for a long time, all of the XP that was accumulated in the background after reaching L30 have suddenly been applied in the update. However, buildings have remained at L30. So instead of the buildings being 5 star, they are now a lot lower star rating.
Star ratings on buildings are much more important after the update. So, as an example, my "racing" account has become Level 38 and my buildings reduced to 3.5 stars. I calculated it will take about 15 months to get my buildings to the same level as the team, because each building takes 1 week to gain 1 level (unless you spend a LOT of tokens). This is why it would be better for me to have the team reduced to Level 31, only 1 level above the buildings.