Originally Posted by
Steve B.
To be specific, the actual function I understand but having never had a need for it, am OK with leaving it in an Off state
It's the second route thing (not recalculation) that people need to understand. With turn guidance, there's always a second route (whether or not recalculation is being used).
Recalculation modifies this second route.
Turning recalculation off is reasonable to do. People don't generally need to use it (if they intend to hew to the loaded track). Usually, the quickest way back to the track is doing a U-turn.
In any case, the issue you were having with recalculation is not typical.