Any hindrance we can put on the Finnish-Russian border to stop them just unloading 12 cars of fresh troops in the middle of the country is a good thing.
Even Unicef has a massive logistics center in Denmark with pallets of stuff categorised and ready to be sent for any emergency: https://www.unicef.org/supply/warehousing-and-distribution
Russia just likes to kill the shit out of their neighbours which is a lot easier logistically.
(Of course a more thorough analysis would probably come to the conclusion that better logistics is worth it. There's still an opportunity cost for those conscripts who could do something else instead, like dying in zerg rushes on the Ukrainian front. And even though those conscripts are 'free' they still require chow and a place to sleep etc.)
Now you’re just being silly.
Those few connections in the sparse north of the country are the entire point.
Of course, if it does go that far, tanks and trains can move rolling stock, rip up the tracks, blow up bridges and other infrastructure behind them if they're forced to retreat.
