Having everything together in the same repo is great if - you don't care about tests that span multiple versions of the app (e.g. patterns of usage around data

Having everything together in the same repo is great if - you don't care about tests that span multiple versions of the app (e.g. patterns of usage around database upgrades) - you don't care about git bisect sessions that evaluate a new test against old versions of the app - you never want to try the new app on the old infra or the old app on the new infra - you're not worried about tests written by people not on your team whose failures indicate scenarios that don't require action on your part (but might require action on theirs).