The 4-track limit means you can build a hardware DJ controller that supports stems. It also means your software doesn't have to have a crazy unlimited-track int

The 4-track limit means you can build a hardware DJ controller that supports stems. It also means your software doesn't have to have a crazy unlimited-track interface. 4 tracks is the sweetspot where you can actually build usable products around this for live performance. Clarification: When I say build hardware, I mean design a usable hardware interface for mixing 4 stems. I don't have to guess what audio is on what track. Imagine what a nightmare it would be if every stem had a different number of tracks and you were trying to DJ live with them.