In reply to Ryan Hellyer.

I’ve had it in my head that I should make a simpler Jetpack plugin for years.

There’s a few other reasons. Some of the modules co-operate with others. For example, by default the projects post type displays has related posts enabled.

And the new, free, theme I am working on supports every single one of the features. I have them all enabled on my personal site.

And Jetpack.

The plugin does not load any of the code unless the module is enabled.
As seen here: https://github.com/BinaryMoon/wp-toolbelt/blob/master/index.php#L23-L43

So apart from disk space the modules don’t take up any processing power if they aren’t turned on.