I think I hope it gets reverted (though yes, worth giving it a try!), we haven’t had a problem with the orange being used a lot in Ambiance, really (though maybe this is an issue we’re trying to fix here). But I recognize I’m just one voice and not a professional designer so I’ll accept whatever the pros say in the end I’m sure I’ll get used to the seemingly-random blue eventually. Also that says in Unity 8 it was used in progress bars, not necessarily sliders? It would be very useful to know why the Unity 8 designers chose to use blue in certain situations in the first place… But I guess it might be tricky to track down exactly who made that decision and tricky to get a respones from them… If they could give a good reason then I’d be more inclined to back the switch to blue (which I know many do really like as a decision).
I don’t think @madsrh 's blue makes a clear difference, personally.
Agreed that aubergine probably doesn’t work well on dark backgrounds
Also, @didrocks, I’m assuming that site will be taken down at some point (because it’s docs for the obsolete Ubuntu Phone), where’s the source for that site? Would be nice if someone could fork a copy before it gets removed because that looks like an incredibly useful resource!