Well the 'sacrilege' comment was really about my sense that sometimes I think people start to think of power as this completely objective data point. It is on the measurement side but not on the generation side.

Then I think once people hear the word 'objective' used to semi-correctly describe power, this results in the sense there is one High Holy Number to be discovered by riding The Perfect Test. I'm not saying OP thinks this way, just that based on my reading on BF, I believe some people start to think this way.

The reason I would ride the test is that I think it's worthwhile to develop an understanding of how various factors impact the power you can put out. I'm perhaps looking at this a little differently than OP, but my approach might have value to him. For me, I use my power meter in training but also in racing. I will race on days with different conditions, so I want to have a sense of how this will affect my pacing. For me, there really is no Perfect Test. Some will be better than others and part of working with power is learning to parse this out.

At any rate, it will be a good workout and a good opportunity to do something harder than usual. If you find cold and wind to be challenging, my attitude is that you should seek opportunities to ride in those conditions, provided its not dangerous to do so.

When I say I don't ride a lot of FTP tests, in some ways that's not true. I actually ride them routinely, when you consider a lot of the workouts I do contain elements that are very test-like. I think the difference is that I don't take the time to rest and go through a formal protocol because it's just not necessary once you've been doing it awhile and have generated substantial data. Which is what multiple people are saying all throughout this thread, just a little more succinctly than I am.