[aldanor]

There's tons of brilliant native non-free Mac apps, so what?

Why would you need to make anyone outside of Mac/iOS world care about it in order for your app to succeed?

[smoldesu]

Love it or lump it, that's where the users are. Limiting your userbase inherently gimps the value proposition of your application, which is especially an issue when your program is something as simple as an email client.