In many cases, you need your checked bag with you to clear customs. I would say the majority of flights arriving at Vienna are international. So, it is less problematic for you to drop it off to your connection, whichever mode that is on.
If you had checked baggage on a flight to Saltzburg with a connection in Vienna, is the train going to handle your baggage thru the connection? If they want to make the mode connection seamless, that would need to happen.
Hey hey! A wiser use of modes.
https://www.msn.com/en-us/travel/news/austrian-airlines-replaces-short-flights-with-trains-as-part-of-government-bailout/ar-BB16oJsn?ocid=msedgdhp
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