It serves different business purposes. Atlassian make money by selling each individual product license. Also there is a reason why they are not part of a single

It serves different business purposes. Atlassian make money by selling each individual product license. Also there is a reason why they are not part of a single unified platform, some of then were aquisitions, etc. There are many players doing "unix" application, and very few trying to build a suite. You need to pick your fights.