[e3b0c]

Monorepo could be a decent choice if your software stack does not require too much external dependencies. Or more precisely, the ratio of own code to the third-party code is reasonably high.

Let me give a concrete example. The Android open source project (AOSP) which builds the system of Android devices has the code size close to the scale of tens of GB (let alone all the histories!). It is already a massive monorepo in itself. And typically you would have many of them from different OEM/SoC vendors of different major releases. In such a scenario, it would turn into 'a monorepo of monorepos,' which is quite unpleasant to imagine.