SSMS is also a multi-GB install full of stuff not useful to anyone who isn't a 100% fulltime DBA versus Azure Data Studio is barely more than the usual Electron app install footprint and leaves the lesser needed functions to plugins/extensions, and ADS supports cross platform work (the above commenter mentions working on macOS) where SSMS is not cross platform at all. Azure Data Studio has plenty of advantages over SSMS.

As a developer, I understand my need to have all 20-120+ GBs of Visual Studio installed, but between SSDT in Visual Studio and Azure Data Studio, I am happy to avoid spending all that hard drive space on SSMS for features I don't need as a developer.