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TTM
The resistance curve for a turbo trainer isnt going to be accurate enough from unit to unit (within the same make and model). For the calculated Power to be particulary accurate.
But the resistance curve of Your own turbo should remain the same providing bearings or whatever arent fried. So setting a FTP via TrainerRoad. Still means all subsquent turbo training using this FTP is accurate, as is Your own progress. Which all you really want this data for.
Even using my powermeter both indoors and out. I get very different results. So its probably best just to consider turbo FTP as useful for turbo training only.