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Comparing Strava estimated power to actual power is ridiculous. It's so far out
Well yeah, I mean one is supplied in real time from a specific device and the other is produced after the fact by some black box calculation.
that it's utterly pointless
Not really - it gives you low / medium / high which is probably good enough if you don't mind your power information coming to you after the ride is over. It will answer the 'did I smash it?' question.
I mean let's face it - owning a power meter is pointless unless you are really systematic and scientific in your training.
2 sets of data for the same ride? I'm not aware of any way to combine them, nope. I'm sure it's technically possible, I'm just not aware of any numpty-level tool which will do it. Fit file tools has a file combiner function but I think that's for splicing together sequential rides rather than merging two concurrent ride files.
Edit: Looks like TP can do it using its AutoMerge function.