Cool video and tool/tape. With drunkard's path I think it my biggest problem is that the way I want to attach the two pieces isn't really the way they go. Sort of like when I put 60 degree triangles together, the points don't look right to me.
I haven't used wonder tape but a year or two ago I did a grandmother's fan in a similar way, but with a textural component using rickrack. I call it the "Eleanor Burns" method because I got it from her, but it is very similar in concept, that is using something so prevent pinning/help our curves.
The rick rack bit starts around minute 18.
https://www.youtube.com/watch?v=Ktzb2wMMwzc
I used it in my "Turkey Fan" (Thanksgiving themed) quilt. I really wanted the extra design/texture element for my turkeys.
https://www.quiltingboard.com/member...14-621653.html
I had no problems with either the smaller "pie" or the larger fan curves, but I chose to use a foundation method instead of piecing the arcs together. I've done fans and drunkard's path and similar projects before in old school ways -- but I think this sort of thing is the way I'll be going in the future. I think a little pinch press of the center line helps too.
I also think having actual heavy templates you can cut around, or paper patterns you pin and cut really helps all curved projects. I bought a set of templates for my fans even knowing it was probably the only time I would ever use them, but for that many unique blades I didn't want to be dealing with anything slightly off from use.