Consistency is non-existent amongst apps. Even on OSX, for all their insistence on their Human Interfaces Guideline, the experience of using multiple apps is still a patchwork of styles. If your needs are fairly generic, you can assemble a fairly consistent set of apps, if you accept some that are crippled or plain lousy.

Not personal but I can't resist: "A foolish consistency is the hobgoblin of little minds." (Emerson)