Fast implementation of basic administrative functionality
Community support for libraries
Several ready-made integrations with libraries from other frameworks(for example, VichUploaderBundle and UserBundle)
Customer-ready admin panel design
Cons
It may be more difficult to implement custom functionality in some cases.
You’ll have to follow the ideology of the library and adapt to its capabilities as well as to its limitations.
You’ll be dependent on a ready-made solution. In some cases, you’ll have to wait for a solution to a problem in a library or get into someone else’s code yourself. But this is an open-source framework and getting into someone else’s code is considered the norm. In fact, there are stable release versions that supposedly have a minimum number of bugs.
75.9% United States of America (the) 
12.6% Russian Federation (the) 
5.6% China 
1.1% Singapore