[johannes1234321]

A few bash scripts work up to some size. For many projects at some time demands increase and you got longer test runs, which eventually require more machines and and different independent build steps (maybe you don't want to build the core libraries which are rarely touched for each commit of other parts etc.?) and at some point it breaks apart and you need something "proper" especially if you then also want to integrate test results with code review and track them from the single planning tool.