Oh, Silverlight is a 'plugin', a plugin need to be compatible with more hosts, so a 64bit version is necessary, bloated or not.
On the other hand, Visual Studio is an ecosystem, it need to be compatible with more 'plugins', even itself is assembled by lots of plugins, so having a 64bit version of shell means much more work for internal teams and external partners, different story.
Huh, Rico was working on some 'internel incubation project' from summer 2010 to winter 2011.
Rico Mariani became my boss last summer
was working on an internal team that I could not write much about for the last couple of years
I know its completely off-topic but ......