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Which is a disadvantage if you race with power because you're not used to measuring your effort / watching your watts.
I don't race, so can't offer much insight there - the most recent event that I did that requires a number being pinned on was Dalsnibba last year, which I very much rode to the number on the Garmin. Setting an average of 250 watts for the whole climb saw me set a PR on the final third (before I rode it to the power meter figure I did the standard "out to hard, blow on the final ascent").
i.e. I think it's different when you're in the sitting room trying to watch Easties and get a 2x20 done vs. out on the road trying to beat the bunch of guys from the cabin next to you because reasons.
Because I am a mental weakling I like smart trainers - they ensure that if your interval is 20 minutes at 280 watts then that's what you are going to do, not the first three minutes at 300, then 10 minutes at 280 and the final seven minutes varying between (I can do this!) 320 and (fuck this hurts!) 250.
Plot the session, hit go, turbo inflicts suffering on you, fin.