Flight plans - filed vs. cleared

I live in the flight path for KSTL and in particular flights flying the AARCH2 arrival fly right over my house.

The instructions in that arrival specify the final few airspace fixes depending on landing runways 12 or 30.

When I decode the flight plan on FlightAware it always shows the flight taking the path for 30L/R even if the flight actually lands on 12 L or 12 R.

I’m curious if the airlines always file the same flight plan to save time and then let the conditions dictate what is actually flown at the time of flight?

Thanks in advance.

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