What tension exists between early lab testing and methods prioritized by the pressure of rapid software releases?

Answer

Depth versus breadth in testing methods

Early resource-intensive lab methods prized depth (detailed understanding), while the pressure of rapid releases pushed for breadth (testing more users faster, even if data per user was less rich).

What tension exists between early lab testing and methods prioritized by the pressure of rapid software releases?
inventiondesigntestusabilityuser experience