Why does the TFS build run serially on build agents? Why not parallel builds?

Question

Why does the TFS run only one build at a time on the build agents? Why cant it spin up another process and kick off another build on the same build agent?

Forgive me if I am missing something too obvious.

Answer 1

Build (and test) Agent are designed to do sequential builds.

If you need parallel builds on a machine, just add more agents.

I currently have 24 agents on a single machine capable of running 24 builds in parallel.