Well we'll have to wait and see if the fueling is an issue, because the stock 2.0 is 101kW, 174Nm, multiport injection, not direct injection. On the face of it these are not exceptional figures for a normally aspirated donk and the boost will still obey the ideal gas laws and adiabatic efficiences of "20 years ago".
I'm not sure that a light switch analogy is appropriate, because that tended to happen when the boot was put in causing boost spike, otherwise the wastegates were under control of a boost controller like they are today. It was never a problem having the boost come on early in the rpm band like the 2.0T might, it was just that there was a preference to have it come on around peak VE or later and therefore the pressure ratios on the front end and the expansion ratios on the backend selected for midrange spool. Whereas the peak power on the 2.0T will probably be around 6,600 rpm, guys in the 80's were putting on hybrids to come on boost way past stock rpm so they could exceed 10,000 rpm; such was favoured method.
The earlier you bring boost on with any engine, the earlier and therefore higher the peak torque figure. Having 1kW@1500 rpm is going to show up as twice the torque of 1kW@3000rpm. There is no black magic in this and highlights the danger of putting too much emphasis on torque numbers.
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