When it comes to filter cones, flutes are for fairies.
After watching the pour over vid where the guy uses a homemade spiral of wire I started thinking of the cone as nothing but a filter holder. That spiral is literally doing nothing other than holding the paper filter up in the air.
You can adjust everything with grind and pour over (flow control) so I'd sure take one of these custom brewers with flutes, ridges, groves, smooth, rough.....
whatever and manipulate the brewing accordingly with whatever configuration it's in.
John F