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Slides have two distinct drawbacks for production cars.
The first is costs. Simply put a disc pivoting on a shaft is cheaper to make than a sliding block which needs precision machining to wort properly.
The second is slides have a notorious habit of sticking if there is a build up of dirt / grit or any other rubbish on the slide.
Most car makers simply don't want to know about that sort of potential problem.
By the way the SU carb dating back to the very start of car manufacture was a slide type.
Cheers , Pete.
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