Comment # 1 on bug 1093633 from James Oakley

This is the expected behaviour. All plugins are built as modules so that the
package can accommodate any setup and not have unneeded plugins loaded. The
alternative is to compile all plugins into one giant binary, but that is a
waste of memory and CPU resources, affecting application performance, and it
won't work anyway since some plugins conflict with others.

You can load needed plugins by name to match what your application requires,
eg:

uwsgi --plugin pypy --plugin rpc --plugins-list

or:

uwsgi --plugin php --plugins-list

Or set "plugin = whatever" in your config file, of course.

You can also use --autoload to automatically load plugins based on the other
parameters given, but explicit is better than implicit.