I used AD since 2 months to draw Origami Books and I join Octa to tell that a 22.5° option is crucial for our origami community.
I tried to convinced more people to leave illustrator and Inkscape and join AD, creating for example a facebook group "Use Affinity Designer to draw your diagrams" https://www.facebook.com/groups/194635127849049/
But it's hard to convince them to move to AD without the 22.5° missing option.
Hope this could be include into the soft. That will help a lot to convince more Origami Designers to use AD.