For our project, a flow like `create feature branch -> implement -> push -> review -> merge to master` is rarely something that finishes every day (but there are daily changes to master from someone else on the team). Builds are something that happens for every change to master, and there is constant QA on those builds. Even if we chose to release those builds to customers, the question of "did a fix for bug X make it into build Y" would still arise quite often.