Of course I knew Nokia would get everyone's vote but there's one issue that really concerns me about this trend. <snipped>
It currently stands at 9:4, so there are yet far too few votes. Still, that is 30% in favour of retaining, which is more than HTC's slice of the WP pie.
I haven't yet voted.
If the moniker serves the purpose of promoting "Windows Phone" as opposed to Lumia, then I absolutely see the case for retaining the title, for all the reasons you mentioned. However, I don't understand how the title "Signature Phone" relates to the term "Windows Phone". I expected that U.S. media market participants could explain it to me, but apparently not.
Based on the comments, it appears that only us geeks attribute any meaning to that title. I say that because the term does pop up every so often in the forums. Recently I've seen quite a few references to it. The thing is, even if that title truly is without meaning and consequence, it still triggers an emotional reaction in many people. It appears to imply that HTC is the only one making "real" windows phones. If that is all it achieves, then I think Microsoft and HTC should get rid of the moniker just as formally as it was introduced. This is what I'm leaning towards.
I'd be interested in the opinion of those who think HTC should retain that title.