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I encountered that engine but I am pretty sure they dropped it as you said because they could not get the air flow exact and it burned lean-rich each stroke. In which case it might fail smog inspections depending on how good your valve system is today.
Other than that and a few people tossing ideas out there so far throttleless engines aren't peing pitched.
Turbos are useful. They allow a much smaller engine to produce more power. It drastically increases the engines power to weight which matters in very small vehicles. That said the avg production car weighs well over 1 ton so saving a hundred pounds on engine isn't going to heavily impact FE. They do it for performance reasons, because its cheaper to build a block with x horsepower and charge it to y than build one that can produce y NA.
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