what is wrong with "na 4cylinders" ?? yeh. fair enuf they dont output as much power as other manufacturers. but theres more to a car than power output

the market that arent "car enthusiasts" dont really give a shit whether its turbo or not. as long as its got the power they need, for their requirements, or aesthetically appealing, or maybe that just want a reliable car or so forth, then consumers are going to buy.. just because they dont have turbo's in their car doesnt mean they're "falling behind" on technology
company's all develop cars to a diff marketshare.. the majority of company's develop all diff cars for diff segments of the market, having advantages or preference in some segment over the other.