Its "batteries included" philosophy (well, more like the entire power plant) – for example, very convenient and broad visualization and declarative UI libraries

Its "batteries included" philosophy (well, more like the entire power plant) – for example, very convenient and broad visualization and declarative UI libraries; very good online documentation as well; of course, the OG interactive notebook interface, too. If the cost of that is shining Stephen Wolfram's dome, well, what can you do.