The closest thing to a plug and play numbered turnout is American Models. Their sectional track system is well made but does not have integral roadbed. Curved turnouts are made because the can directly substitute for straight or curved sectional track pieces where numbered turnouts cannot. MTH and Lionel turnouts are also closed frog designs. As you state, using numbered turnouts in S scale is a lot more work. In O gauge the market is so large that numbered turnouts are available as plug and play plus with three rails the frog polarity does not need to be switched.
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