Lets face it, timelines are shrinking with every successive project. What took 18 months earlier is expected in 12 months now. Derivative projects that took 6-9 months are expected to finish in 3-4 months! This is the demand of the market.
To execute projects in such drastically shrunk schedules, activities that were traditionally done serially are now being done in parallel. For example, software development and testing typically started once the hardware prototypes were ready. Consequently, software engineers did not have to debug hardware issues, as the hardware platform was typically quite stable.